xev displays those
KeyPress event, serial 31, synthetic NO, window 0x3c00001, root 0x69, subw 0x0, time 4199027, (781,-45), root:(788,6), state 0x100, keycode 101 (keysym 0x0, NoSymbol), same_screen YES, XLookupString gives 0 bytes: XmbLookupString gives 0 bytes: XFilterEvent returns: False
KeyRelease event, serial 31, synthetic NO, window 0x3c00001, root 0x69, subw 0x0, time 4199064, (782,-45), root:(789,6), state 0x100, keycode 101 (keysym 0x0, NoSymbol), same_screen YES, XLookupString gives 0 bytes: XFilterEvent returns: False
xev displays those
KeyPress event, serial 31, synthetic NO, window 0x3c00001,
root 0x69, subw 0x0, time 4199027, (781,-45), root:(788,6),
state 0x100, keycode 101 (keysym 0x0, NoSymbol), same_screen YES,
XLookupString gives 0 bytes:
XmbLookupString gives 0 bytes:
XFilterEvent returns: False
KeyRelease event, serial 31, synthetic NO, window 0x3c00001,
root 0x69, subw 0x0, time 4199064, (782,-45), root:(789,6),
state 0x100, keycode 101 (keysym 0x0, NoSymbol), same_screen YES,
XLookupString gives 0 bytes:
XFilterEvent returns: False