XtGetApplicationNameAndClass - retrieve application name and class
#include <X11/Intrinsic.h>
void XtGetApplicationNameAndClass(Display* display,
    String* name_return, String* class_return);
  - display
- Specifies an open display connection that has been initialized with
      XtDisplayInitialize.
- name_return
- Returns the application name.
- class_return
- Returns the application class.
XtGetApplicationNameAndClass returns the application name and class
  passed to XtDisplayInitialize for the specified display. If the display
  was never initialized or has been closed, the result is undefined. The
  returned strings are owned by the Intrinsics and must not be modified or freed
  by the caller.
XtDisplayInitialize(3)
X Toolkit Intrinsics - C Language Interface
Xlib - C Language X Interface