With View LMP key active, you will see this messages in the TPX startup:
TPX9925 OPTION VIEW OF UNICENTER CA-TPX IS AUTHORIZED
When you remove the LMP keys, these messages will disappear after the next IPL.
To see if any users are accessing TPXVIEW, search for TPXL0036 messages in the TPX log that indicate session TPXVIEW:
TPXL0036 12/01/08.336 17:16:19.75 ACB *INTRNAL SELECTED FOR USER USERX01 APPL TPXVIEW 2E6E7C7