path: root/lib/reltool/doc/src/reltool.xml

<?xml version="1.0" encoding="ISO-8859-1" ?>
<!DOCTYPE erlref SYSTEM "erlref.dtd">

<erlref>
  <header>
    <copyright>
      <year>2009</year>
      <year>2009</year>
      <holder>Ericsson AB, All Rights Reserved</holder>
    </copyright>
    <legalnotice>
  The contents of this file are subject to the Erlang Public License,
  Version 1.1, (the "License"); you may not use this file except in
  compliance with the License. You should have received a copy of the
  Erlang Public License along with this software. If not, it can be
  retrieved online at http://www.erlang.org/.

  Software distributed under the License is distributed on an "AS IS"
  basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
  the License for the specific language governing rights and limitations
  under the License.

  The Initial Developer of the Original Code is Ericsson AB.
    </legalnotice>

    <title>reltool</title>
    <prepared>H&aring;kan Mattsson</prepared>
    <responsible>H&aring;kan Mattsson</responsible>
    <docno></docno>
    <approved>H&aring;kan Mattsson</approved>
    <checked></checked>
    <date></date>
    <rev>%VSN%</rev>
  </header>
  <module>reltool</module>
  <modulesummary>Main API of the Reltool application</modulesummary>
  <description>
    <p>This is an interface module for the Reltool application.</p>

    <p><em>Reltool</em> is a release management tool. It analyses a
    given Erlang/OTP installation and determines various dependencies
    between applications. The <c>graphical</c> frontend depicts the
    dependencies and enables interactive customization of a target
    system. The backend provides a <c>batch</c> interface for
    generation of customized target systems.</p>

    <p>The tool uses an installed Erlang/OTP system as input.
    <c>root_dir</c> is the root directory of the analysed system and
    it defaults to the system executing <c>reltool</c>. Applications
    may also be located outside <c>root_dir</c>. <c>lib_dirs</c>
    defines additional library directories where applications
    additional may reside and it defaults to the the directories
    listed by the operating system environment variable
    <c>ERL_LIBS</c>. See the module <c>code</c> for more info.
    Finally single modules and entire applications may be read from
    Escripts.</p>

    <p>Some configuration parameters control the behavior of Reltool
    on system (<c>sys</c>) level. Others provide control on
    application (<c>app</c>) level and yet others are on module
    (<c>mod</c>) level. Module level parameters overrides application
    level parameters and application level parameters overrides system
    level parameters. Escript <c>escript</c> level parameters
    overrides system level parameters.</p>

    <p>The following top level <c>options</c> are supported:</p>

    <taglist>

      <tag><c><![CDATA[config]]></c></tag>
      <item>
        <p>This is the main option and it controls the configuration
           of <c>reltool</c>.  It can either be a <c>sys</c> tuple or
           a name of a <c>file</c> containing a sys tuple.</p>
      </item>

      <tag><c><![CDATA[trap_exit]]></c></tag>
      <item>
        <p>This option controls the error handling behavior of
           <c>reltool</c>.  By default the window processes traps
           exit, but this behavior can altered by setting
           <c>trap_exit</c> to <c>false</c>.</p>
      </item>

      <tag><c><![CDATA[wx_debug]]></c></tag>
      <item>
        <p>This option controls the debug level of <c>wx</c>. As its
           name indicates it is only useful for debugging. See
           <c>wx:debug/1</c> for more info.</p>
      </item>

    </taglist>

    <p>Besides the already mentioned source parameters <c>root_dir</c>
    and <c>lib_dirs</c>, the following system (<c>sys</c>) level
    options are supported:</p>

    <taglist>

      <tag><c><![CDATA[erts]]></c></tag>
      <item>
        <p>Erts specific configuration. See application level options
        below.</p>
      </item>

      <tag><c><![CDATA[escript]]></c></tag>
      <item>
        <p>Escript specific configuration. An escript has a mandatory
        file name and escript level options that are described
        below.</p>
      </item>

      <tag><c><![CDATA[app]]></c></tag>
      <item>
        <p>Application specific configuration. An application has a
        mandatory name and application level options that are
        described below.</p>
      </item>

      <tag><c><![CDATA[mod_cond]]></c></tag>
      <item>
        <p>This parameter controls the module inclusion policy. It
        defaults to <c>all</c> which means that if an application is
        included (either explicitly or implicitly) all modules in that
        application will be included. This implies that both modules
        that exists on the <c>ebin</c> directory of the application,
        as well as modules that are named in the <c>app</c> file will
        be included. If the parameter is set to <c>ebin</c>, both
        modules on the <c>ebin</c> directory and derived modules are
        included. If the parameter is set to <c>app</c>, both modules
        in the <c>app</c> file and derived modules are included.
        <c>derived</c> means that only modules that are used by other
        included modules are included. The <c>mod_cond</c> setting on
        system level is used as default for all applications.</p>
      </item>

      <tag><c><![CDATA[incl_cond]]></c></tag>
      <item>
	<p>This parameter controls the application and escript
	inclusion policy. It defaults to <c>derived</c> which means
	that the applications that not have any explicit
	<c>incl_cond</c> setting, will only be included if any other
	(explicitly or implicitly included) application uses it. The
	value <c>include</c> implies that all applications and
	escripts that that not have any explicit <c>incl_cond</c>
	setting will be included. <c>exclude</c> implies that all
	applications and escripts) that that not have any explicit
	<c>incl_cond</c> setting will be excluded.</p>
      </item>

      <tag><c><![CDATA[boot_rel]]></c></tag>
      <item>
        <p>A target system may have several releases but the one given
        as <c>boot_rel</c> will be used as default when the system is
        booting up.</p>
      </item>

      <tag><c><![CDATA[rel]]></c></tag>
      <item>
        <p>Release specific configuration. Each release maps to a
        <c>rel</c>, <c>script</c> and <c>boot </c> file. See the
        module <c>systools</c> for more info about the details. Each
        release has a name, a version and a set of applications with a
        few release specific parameters such as type and included
        applications.</p>
      </item>

      <tag><c><![CDATA[relocatable]]></c></tag>
      <item>
	<p>This parameter controls whether the <c>erl</c> executable
	in the target system automatically should determine where it
	is installed or if it should use a hardcoded path to the
	installation. In the latter case the target system must be
	installed with <c>reltool:install/2</c> before it can be
	used. If the system is relocatable, the file tree containing
	the target system can be moved to another location without
	re-installation. The default is <c>true</c>.</p>
      </item>

      <tag><c><![CDATA[profile]]></c></tag>
      <item>
	<p>The creation of the specification for a target system is
	performed in two steps. In the first step a complete
	specification is generated. It will likely contain much more
	files than you are interested in your customized target
	system. In the second step the specification will be filtered
	according to your filters. There you have the ability to
	specify filters per application as well as system wide
	filters. You can also select a <c>profile</c> for your
	system. Depending on the <c>profile</c>, different default
	filters will be used. There are three different profiles to
	choose from: <c>development</c>, <c>embedded</c> and
	<c>standalone</c>. <c>development</c> is default. The
	parameters that are affected by the <c>profile</c> are:
	<c>incl_sys_filters</c>, <c>excl_sys_filters</c>,
	<c>incl_app_filters</c> and <c>excl_app_filters</c>.</p>
      </item>

      <tag><c><![CDATA[app_file]]></c></tag>
      <item>
        <p>This parameter controls the default handling of the
        <c>app</c> files when a target system is generated. It
        defaults to <c>keep</c> which means that <c>app</c> files are
        copied to the target system and their contents are kept as
        they are. <c>strip</c> means that a new <c>app</c> file is
        generated from the contents of the original <c>app</c> file
        where the non included modules are removed from the
        file. <c>all</c> does also imply that a new <c>app</c> file is
        generated from the contents of the original <c>app</c> file,
        with the difference that all included modules are added to the
        file. If the application does not have any <c>app</c> file a
        file will be created for <c>all</c> but not for <c>keep</c>
        and <c>strip</c>.</p>
      </item>

      <tag><c><![CDATA[debug_info]]></c></tag>
      <item>
        <p>The <c>debug_info</c> parameter controls whether the debug
        information in the beam file should be kept (<c>keep</c>) or
        stripped <c>strip</c> when the file is copied to the target
        system.</p>
      </item>

      <tag><c><![CDATA[incl_sys_filters]]></c></tag>
      <item>
        <p>This parameter normally contains a list of regular
        expressions that controls which files in the system that
        should be included. Each file in the target system must match
        at least one of the listed regular expressions in order to be
        included. Further the files may not match any filter in
        <c>excl_sys_filters</c> in order to be included. Which
        application files that should be included are controlled with
        the parameters <c>incl_app_filters</c> and
        <c>excl_app_filters</c>. This parameter defaults to
        <c>[".*"]</c>.</p>
      </item>

      <tag><c><![CDATA[excl_sys_filters]]></c></tag>
      <item>
        <p>This parameter normally contains a list of regular
        expressions that controls which files in the system that not
        should be included in the target system. In order to be
        included, a file must match some filter in
        <c>incl_sys_filters</c> but not any filter in
        <c>excl_sys_filters</c>. This parameter defaults to
        <c>[]</c>.</p>
      </item>
      <tag><c><![CDATA[incl_app_filters]]></c></tag>
      <item>
        <p>This parameter normally contains a list of regular
        expressions that controls which application specific files
        that should be included. Each file in the application must
        match at least one of the listed regular expressions in order
        to be included.  Further the files may not match any filter in
        <c>excl_app_filters</c> in order to be included. This
        parameter defaults to <c>[".*"]</c>.</p>
      </item>

      <tag><c><![CDATA[excl_app_filters]]></c></tag>
      <item>
        <p>This parameter normally contains a list of regular
        expressions that controls which application specific files
        that not should be included in the target system. In order to
        be included, a file must match some filter in
        <c>incl_app_filters</c> but not any filter in
        <c>excl_app_filters</c>. This parameter defaults to
        <c>[]</c>.</p>
      </item>

      <tag><c><![CDATA[incl_archive_filters]]></c></tag>
      <item>
        <p>This parameter normally contains a list of regular
        expressions that controls which top level directories in an
        application that should be included in an archive file (as
        opposed of beeing included as a regular directory outside the
        archive). Each top directory in the application must match at
        least one of the listed regular expressions in order to be
        included. Further the files may not match any filter in
        <c>excl_app_filters</c> in order to be included. This
        parameter defaults to <c>[".*"]</c>.</p>
      </item>

       <tag><c><![CDATA[excl_archive_filters]]></c></tag>
      <item>
        <p>This parameter normally contains a list of regular
        expressions that controls which top level directories in an
        application that not should be included in an archive file. In
        order to be included in the application archive, a top
        directory must match some filter in <c>incl_archive_filters</c>
        but not any filter in <c>excl_archive_filters</c>. This
        parameter defaults to <c>["^include$","^priv$"]</c>.</p>
      </item>

      <tag><c><![CDATA[archive_opts]]></c></tag>
      <item>
        <p>This parameter contains a list of options that are given to
        <c>zip:create/3</c> when application specific files are
        packaged into an archive. All options are not supported. The
        most useful options in this context, are the ones that
        controls which types of files that should be compressed. This
        parameter defaults to <c>[]</c>.</p>
      </item>

    </taglist>

    <p>On application (<c>escript</c>) level,the following options are
    supported:</p>

   <taglist>
      <tag><c><![CDATA[incl_cond]]></c></tag>
      <item>
        <p>The value of this parameter overrides the parameter with the
        same name on system level.</p>
      </item>
    </taglist>

    <p>On application (<c>app</c>) level,the following options are
       supported:</p>

   <taglist>
      <tag><c><![CDATA[vsn]]></c></tag>
      <item>
        <p>The version of the application. In an installed system there may
        exist several versions of an application. The <c>vsn</c> parameter
        controls which version of the application that will be choosen. If it
        is omitted, the latest version will be choosen.</p>
      </item>
      <tag><c><![CDATA[mod]]></c></tag>
      <item>
        <p>Module specific configuration. A module has a mandatory
        name and module level options that are described below.</p>
      </item>
      <tag><c><![CDATA[mod_cond]]></c></tag>
      <item>
        <p>The value of this parameter overrides the parameter with the
        same name on system level.</p>
      </item>
      <tag><c><![CDATA[incl_cond]]></c></tag>
      <item>
        <p>The value of this parameter overrides the parameter with the
        same name on system level.</p>
      </item>
      <tag><c><![CDATA[app_file]]></c></tag>
      <item>
        <p>The value of this parameter overrides the parameter with the
        same name on system level.</p>
      </item>
      <tag><c><![CDATA[debug_info]]></c></tag>
      <item>
        <p>The value of this parameter overrides the parameter with the
        same name on system level.</p>
      </item>
      <tag><c><![CDATA[incl_app_filters]]></c></tag>
      <item>
        <p>The value of this parameter overrides the parameter with the
        same name on system level.</p>
      </item>
      <tag><c><![CDATA[excl_app_filters]]></c></tag>
      <item>
        <p>The value of this parameter overrides the parameter with the
        same name on system level.</p>
      </item>

      <tag><c><![CDATA[incl_archive_filters]]></c></tag>
      <item>
        <p>The value of this parameter overrides the parameter with the
        same name on system level.</p>
      </item>

       <tag><c><![CDATA[excl_archive_filters]]></c></tag>
      <item>
        <p>The value of this parameter overrides the parameter with the
        same name on system level.</p>
      </item>

     <tag><c><![CDATA[archive_opts]]></c></tag>
      <item>
        <p>The value of this parameter overrides the parameter with the
        same name on system level.</p>
      </item>
    </taglist>

     <p>On module (<c>mod</c>) level,the following options are
       supported:</p>

   <taglist>
      <tag><c><![CDATA[incl_cond]]></c></tag>
      <item>
	<p>This parameter controls whether the module is included or not. By
	default the <c>mod_incl</c> parameter on application and system level
	will be used to control whether the module is included or not. The
	value of <c>incl_cond</c> overrides the module inclusion policy.
	<c>include</c> implies that the module is included, while
	<c>exclude</c> implies that the module not is included.
	<c>derived</c> implies that the is included if any included uses the
	module.</p>
      </item>
      <tag><c><![CDATA[debug_info]]></c></tag>
      <item>
        <p>The value of this parameter overrides the parameter with
        the same name on application level.</p>
      </item>
    </taglist>

  </description>

  <section>
    <title>DATA TYPES</title>
    <code type="none"><![CDATA[
options()           = [option()]
option()            = {config, config() | file()}
                    | {trap_exit, bool()}
                    | {wx_debug, term()} 
config()            = {sys, [sys()]}
sys()               = {root_dir, root_dir()}
                    | {lib_dirs, [lib_dir()]}
                    | {profile, profile()}
                    | {erts, app()}
                    | {escript, escript_file(), [escript()]}
                    | {app, app_name(), [app()]}
                    | {mod_cond, mod_cond()} 
                    | {incl_cond, incl_cond()}
                    | {boot_rel, boot_rel()}
                    | {rel, rel_name(), rel_vsn(), [rel_app()]}
                    | {relocatable, relocatable()}
                    | {app_file, app_file()}
                    | {debug_info, debug_info()}
                    | {incl_sys_filters, incl_sys_filters()}
                    | {excl_sys_filters, excl_sys_filters()}
                    | {incl_app_filters, incl_app_filters()}
                    | {excl_app_filters, excl_app_filters()}
                    | {incl_archive_filters, incl_archive_filters()}
                    | {excl_archive_filters, excl_archive_filters()}
                    | {archive_opts, [archive_opt()]}
app()               = {vsn, app_vsn()}
                    | {mod, mod_name(), mod()}
                    | {mod_cond, mod_cond()}
                    | {incl_cond, incl_cond()}
                    | {debug_info, debug_info()}
                    | {app_file, app_file()}
                    | {incl_sys_filters, incl_sys_filters()}
                    | {excl_sys_filters, excl_sys_filters()}
                    | {incl_app_filters, incl_app_filters()}
                    | {excl_app_filters, excl_app_filters()}
                    | {incl_archive_filters, incl_archive_filters()}
                    | {excl_archive_filters, excl_archive_filters()}
                    | {archive_opts, [archive_opt()]}
mod()               = {vsn, app_vsn()}
                    | {incl_cond, incl_cond()}
                    | {debug_info, debug_info()}
rel_app()           = app_name()
                    | {app_name(), app_type()} 
                    | {app_name(), [incl_app()]}
                    | {app_name(), app_type(), [incl_app()]}
app_name()          = atom()
app_type()          = permanent | transient | temporary | load | none
app_vsn()           = string()
archive_opt         = zip_create_opt()
boot_rel()          = rel_name()
app_file()          = keep | strip | all
debug_info()        = keep | strip
dir()               = string()
escript()           = {incl_cond, incl_cond()}
escript_file()      = file()
excl_app_filters()  = regexps()
excl_archive_filters() = regexps()
excl_sys_filters()  = regexps()
file()              = string()
incl_app()          = app_name()
incl_app_filters()  = regexps()
incl_archive_filters() = regexps()
incl_cond()         = include | exclude | derived
incl_sys_filters()  = regexps()
lib_dir()           = dir()
mod_cond()          = all | app | ebin | derived | none
mod_name()          = atom()
profile()           = development | embedded | standalone
re_regexp()         = string()
reason()            = string()
regexps()           = [re_regexp()]
                    | {add, [re_regexp()]}
		    | {del, [re_regexp()]}
rel_file()          = term()
rel_name()          = string()
rel_vsn()           = string()
relocatable         = boolean()
root_dir()          = dir()
script_file()       = term()
server()            = server_pid() | options()
server_pid()        = pid()
target_dir()        = file()
window_pid()        = pid()
base_dir()          = dir()
base_file()         = file()
top_dir()           = file()
top_file()          = file()
target_spec()       = [target_spec()]
                    | {create_dir, base_dir(), [target_spec()]}
                    | {create_dir, base_dir(), top_dir(), [target_spec()]}
                    | {archive, base_file(), [archive_opt()], [target_spec()]}
                    | {copy_file, base_file()}
                    | {copy_file, base_file(), top_file()}
                    | {write_file, base_file(), iolist()}
                    | {strip_beam_file, base_file()}]]></code>

    <marker id="start"></marker>
  </section>

  <funcs>
    <func>
      <name>create_target(Server, TargetDir) -> ok | {error, Reason}</name>
      <fsummary>Create a target system</fsummary>
      <type>
	<v>Server     = server()</v>
        <v>TargetDir  = target_dir()</v>
	<v>Reason     = reason()</v>
      </type>
      <desc><p>Create a target system. Gives the same result as
      <c>{ok,TargetSpec}=reltool:get_target_spec(Server)</c> and
      <c>reltool:eval_target_spec(TargetSpec,RootDir,TargetDir)</c>.</p></desc>
    </func>
    
    <func>
      <name>eval_target_spec(TargetSpec, RootDir, TargetDir) -> ok | {error, Reason}</name>
      <fsummary>Create a target system</fsummary>
      <type>
        <v>TargetSpec = target_spec()</v>
        <v>RootDir    = root_dir()</v>
        <v>TargetDir  = target_dir()</v>
        <v>Reason     = reason()</v>
      </type>
      <desc><p>Create the actual target system from a specification
      generated by <c>reltool:get_target_spec/1</c>. The creation of
      the specification for a target system is performed in two
      steps. In the first step a complete specification will be
      generated. It will likely contain much more files than you are
      interested in in your target system. In the second step the
      specification will be filtered according to your filters. There
      you have the ability to specify filters per application as well
      as system wide filters. You can also select a <c>profile</c> for
      your system. Depending on the <c>profile</c>, different default
      filters will be used.</p>

      <p>The top directories <c>bin</c>, <c>releases</c> and
      <c>lib</c> are treated differently from other files. All other
      files are by default copied to the target system. The
      <c>releases</c> directory contains generated <c>rel</c>,
      <c>script</c>, and <c>boot</c> files. The <c>lib</c> directory
      contains the applications. Which applications that are included
      and if they should be customized (archived, stripped from debug
      info etc.) is specified with various configuration
      parameters. The files in the <c>bin</c> directory are copied
      from the <c>erts-vsn/bin</c> directory, but only those files
      that was originally included in <c>bin</c> directory of the
      source system.</p>

      <p>If the configuration parameter <c>relocatable</c> was set to
      <c>true</c> there is no need to install the target system with
      <c>reltool:install/2</c> before it can be started. In that case
      the file tree containing the target system can be moved without
      re-installation.</p></desc>
    </func>

    <func>
      <name>get_config(Server) -> {ok, Config} | {error, Reason}</name>
      <fsummary>Get reltool configuration</fsummary>
      <type>
        <v>Server  = server()</v>
        <v>Config  = config()</v>
        <v>Reason  = reason()</v>
      </type>
      <desc><p>Get reltool configuration. Shorthand for
      <c>reltool:get_config(Server,false,false)</c>.</p></desc>
    </func>

    <func>
      <name>get_config(Server, InclDefaults, InclDerived) -> {ok, Config} | {error, Reason}</name>
      <fsummary>Get reltool configuration</fsummary>
      <type>
        <v>Server        = server()</v>
        <v>InclDefaults  = incl_defaults()</v>
        <v>InclDerived   = incl_derived()</v>
        <v>Config        = config()</v>
        <v>Reason        = reason()</v>
      </type>
      <desc><p>Get reltool configuration. Normally, only the explicit
      configuration parameters with values that differs from their
      defaults are interesting. But the builtin default values can be
      returned by setting <c>InclDefaults</c> to <c>true</c>. The
      derived configuration can be return by setting
      <c>InclDerived</c> to <c>true</c>.</p></desc>
    </func>

    <func>
      <name>get_rel(Server, Relname) -> {ok, RelFile} | {error, Reason}</name>
      <fsummary>Get contents of a release file</fsummary>
      <type>
        <v>Server  = server()</v>
        <v>RelName = rel_name()</v>
        <v>RelFile = rel_file()</v>
        <v>Reason  = reason()</v>
      </type>
      <desc><p>Get contents of a release file. See <c>rel(4)</c> for more
      details.</p></desc>
    </func>

    <func>
      <name>get_script(Server, Relname) -> {ok, ScriptFile | {error, Reason}</name>
      <fsummary>Get contents of a boot script file</fsummary>
      <type>
        <v>Server     = server()</v>
        <v>RelName    = rel_name()</v>
        <v>ScriptFile = script_file()</v>
        <v>Reason     = reason()</v>
      </type>
      <desc><p>Get contents of a boot script file. See <c>script(4)</c> for
      more details.</p></desc>
    </func>

    <func>
      <name>get_status(Server) -> {ok, [Warning]} | {error, Reason}</name>
      <fsummary>Get contents of a release file</fsummary>
      <type>
        <v>Server  = server()</v>
        <v>Warning = string()</v>
        <v>Reason  = reason()</v>
      </type>
      <desc><p>Get status about the configuration</p></desc>
    </func>

    <func>
      <name>get_server(WindowPid) -> {ok, ServerPid} | {error, Reason}</name>
      <fsummary>Start server process with options</fsummary>
      <type>
        <v>WindowPid   = window_pid()</v>
        <v>ServerPid   = server_pid()</v>
        <v>Reason      = reason()</v>
      </type>
      <desc><p>Return the process identifier of the server process.</p></desc>
    </func>

    <func>
      <name>get_target_spec(Server) -> {ok, targetSpec} | {error, Reason}</name>
      <fsummary>Return a specification of the target system</fsummary>
      <type>
        <v>Server     = server()</v>
        <v>TargetSpec = target_spec()</v>
        <v>Reason     = reason()</v>
      </type>
      <desc><p>Return a specification of the target system. The actual
      target system can be created with
      <c>reltool:eval_target_spec/3</c>.</p>
      </desc>
    </func>

    <func>
      <name>install(Server, TargetDir) -> ok | {error, Reason}</name>
      <fsummary>Install a target system</fsummary>
      <type>
        <v>Server     = server()</v>
        <v>TargetDir  = target_dir()</v>
        <v>Reason     = reason()</v>
      </type>
      <desc><p>Install a created target system</p></desc>
    </func>

    <func>
      <name>start() -> {ok, WindowPid} | {error, Reason}</name>
      <fsummary>Start main window process</fsummary>
      <type>
        <v>WindowPid   = window_pid()</v>
        <v>Reason      = reason()</v>
      </type>
      <desc><p>Start a main window process with default options</p></desc>
    </func>
  
    <func>
      <name>start(Options) -> {ok, WindowPid} | {error, Reason}</name>
      <fsummary>Start main window process with options</fsummary>
      <type>
        <v>Options     = options()</v>
        <v>WindowPid   = window_pid()</v>
        <v>Reason      = reason()</v>
      </type>
      <desc><p>Start a main window process with options</p></desc>
    </func>
  
    <func>
      <name>start_link(Options) -> {ok, WindowPid} | {error, Reason}</name>
      <fsummary>Start main window process with options</fsummary>
      <type>
        <v>Options     = options()</v>
        <v>WindowPid   = window_pid()</v>
        <v>Reason      = reason()</v>
      </type>
      <desc><p>Start a main window process with options. The process is linked.</p></desc>
    </func>
  
    <func>
      <name>start_server(Options) -> {ok, ServerPid} | {error, Reason}</name>
      <fsummary>Start server process with options</fsummary>
      <type>
        <v>Options     = options()</v>
        <v>ServerPid   = server_pid()</v>
        <v>Reason      = reason()</v>
      </type>
      <desc><p>Start a server process with options. The server process
      identity can be given as argument to several other functions in the
      API.</p></desc>
    </func>

    <func>
      <name>stop(Pid) -> ok | {error, Reason}</name>
      <fsummary>Stop a server or window process</fsummary>
      <type>
        <v>Pid     = server_pid() | window_pid()()</v>
        <v>Reason  = reason()</v>
      </type>
      <desc><p>Stop a server or window process</p></desc>
    </func>
  </funcs>
  
</erlref>