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SuSE 11.3 - man page for tk_class (suse section 3)

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Tk_SetClass(3)			      Tk Library Procedures			   Tk_SetClass(3)

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NAME
       Tk_SetClass, Tk_Class - set or retrieve a window's class

SYNOPSIS
       #include <tk.h>

       Tk_SetClass(tkwin, class)

       Tk_Uid
       Tk_Class(tkwin)

ARGUMENTS
       Tk_Window tkwin (in)	      Token for window.

       char *class (in) 	      New class name for window.
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DESCRIPTION
       Tk_SetClass  is	called	to  associate a class with a particular window.  The class string
       identifies the type of the window;  all windows with the same general  class  of  behavior
       (button, menu, etc.) should have the same class.  By convention all class names start with
       a capital letter, and there exists a Tcl command with the same name as each class  (except
       all  in	lower-case)  which can be used to create and manipulate windows of that class.	A
       window's class string is initialized to NULL when the window is created.

       For main windows, Tk automatically propagates the name and class to the WM_CLASS  property
       used by window managers.  This happens either when a main window is actually created (e.g.
       in Tk_MakeWindowExist), or when Tk_SetClass is called, whichever occurs later.  If a  main
       window  has  not  been assigned a class then Tk will not set the WM_CLASS property for the
       window.

       Tk_Class is a macro that returns the  current  value  of  tkwin's  class.   The	value  is
       returned  as a Tk_Uid, which may be used just like a string pointer but also has the prop-
       erties of a unique identifier (see the manual entry for Tk_GetUid for details).	If  tkwin
       has not yet been given a class, then Tk_Class will return NULL.

KEYWORDS
       class, unique identifier, window, window manager

Tk										   Tk_SetClass(3)
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