public void set_wmclass (string wmclass_name, string wmclass_class)
Warning: set_wmclass is deprecated since "3.22".
Don’t use this function.
It sets the X Window System “class” and “name” hints for a window. According to the ICCCM, you should always set these to the same value for all windows in an application, and GTK+ sets them to that value by default, so calling this function is sort of pointless. However, you may want to call set_role on each window in your application, for the benefit of the session manager. Setting the role allows the window manager to restore window positions when loading a saved session.
window name hint
window class hint