XtGetActionKeysym - obtain corresponding keysym
#include <X11/Intrinsic.h>
KeySym XtGetActionKeysym(XEvent* event, Modifiers*
    modifiers_return);
  - event
- Specifies the event pointer passed to the action procedure by the
      Intrinsics.
- modifiers_return
- Returns the modifiers that caused the match, if non-NULL.
If XtGetActionKeysym is called after an action procedure has been invoked
  by the Intrinsics and before that action procedure returns, and if the event
  pointer has the same value as the event pointer passed to that action routine,
  and if the event is a KeyPress or KeyRelease event, then
  XtGetActionKeysym returns the KeySym that matched the final event
  specification in the translation table and, if modifiers_return is
  non-NULL, the modifier state actually used to generate this KeySym; otherwise,
  if the event is a KeyPress or KeyRelease event, then
  XtGetActionKeysym calls XtTranslateKeycode and returns the
  results; else it returns NoSymbol and does not examine
  modifiers_return.
X Toolkit Intrinsics - C Language Interface
Xlib - C Language X Interface