gdk:program-class ()

program-class -- a string with the program class

The gdk:program-class function gets the program class. The (setf gdk:program-class) function sets the program class.

Unless the program class has explicitly been set with the (setf gdk:program-class) function or with the --class command line option, the default value is the program name determined with the g:prgname function and with the first character converted to uppercase.

The X11 backend uses the program class to set the class name part of the WM_CLASS property on toplevel windows. See the Inter-Client Communication Conventions Manual (ICCCM).