Reads Key States. Put it in your User menu.
You probably have other things that do this but all the ones
I have used won't read certain keys.
This will read anything.

PERMISSION  UID  GID    PACKED    SIZE  RATIO METHOD CRC     STAMP     NAME
---------- ----------- ------- ------- ------ ---------- ------------ ----------
[generic]                  571     870  65.6% -lh5- 9f27 Oct 17  1980 KeyStateTester.AMOS
[generic]                  345     586  58.9% -lh5- 04fa Oct 17  1980 KeyState.readme
---------- ----------- ------- ------- ------ ---------- ------------ ----------
 Total         2 files     916    1456  62.9%            Jul 31 02:37