CentOS 7.0 - man page for tk_setclass (centos section 3)
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Tk_SetClass(3) Tk Library Procedures Tk_SetClass(3)
Tk_SetClass, Tk_Class - set or retrieve a window's class
Tk_Window tkwin (in) Token for window.
char *class (in) New class name for window.
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
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.
class, unique identifier, window, window manager
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