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<concept id="GUID-D68E0A64-0E8A-5C52-9C5B-93BA3B80C200" xml:lang="en"><title>Window

Groups and Applications</title><shortdesc>A window group is the basic unit of an application.</shortdesc><prolog><metadata><keywords/></metadata></prolog><conbody>

<p> <b>Variant</b>: Both (ScreenPlay and non-ScreenPlay). <b>Target audience</b>:

Application developers. </p>

<p> The main functions of a window group are: </p>

<ul>

<li id="GUID-7FCE3494-29FA-55D0-B798-825A86230A41"><p>To receive keyboard

focus—unless captured, all key events are sent to the window group that has

keyboard focus. </p> </li>

<li id="GUID-F6CAE40A-72FE-5DC7-8104-173D3AE41BBC"><p>The application that

has keyboard focus is known as the "foreground application". The Window Server

gives the foreground application’s thread extra priority, so that it is responsive

to the user, even if a background application is performing a long-running

task. </p> </li>

<li id="GUID-92F3DF82-02D1-579A-855E-3E9F540B75AF"><p>To control settings

for priority keys and key capture. </p> </li>

<li id="GUID-2760EF21-9193-5F48-9DE0-748BAD2EA9DB"><p>To have an associated

name that can be interrogated by other Window Server clients and used to determine

which applications are running. </p> </li>

<li id="GUID-8CDFDECF-0B23-5BE4-964E-4ABE29F625F2"><p>To have a text cursor.

The text cursor is displayed only for the application with keyboard focus. </p> </li>

<li id="GUID-C184C67F-193B-5498-9537-632B52D53A7A"><p>To form a group for

all other windows owned by an application. </p> </li>

</ul>

<p>A typical application has a single window group, and all its other windows

are descendants of that window group. A system shell application may use the <codeph>RWsSession</codeph> interface

to interrogate all window groups owned by all client applications, and therefore

may display a task list. All applications should use the same policy for the

format of the window group name. This policy is the responsibility of the

GUI, not the Window Server itself. </p>

<p>An <codeph>RWindowGroup</codeph> is a pseudo-window that can never be seen

on screen, but which has an <keyword>ordinal position</keyword> and participates

in parent/child and sibling relationships as all other windows. </p>

</conbody><related-links>

<link href="GUID-99AE1D62-571A-5A63-B472-C0FBC0861F52.dita"><linktext>Window Types</linktext>

</link>

</related-links></concept>