To identify which features of TPX are have active you can check the TPX LOG.
At the start of the LOG you will find messages like these:
TPX9925 OPTION ACLE OF UNICENTER CA-TPX IS AUTHORIZED
TPX9925 OPTION MAILBOX OF UNICENTER CA-TPX IS AUTHORIZED
These TPX9925 messages tell you what is active.
Following LMP-Keys are needed to enable the appropriate functionality.
O0 (Data Compression)
O3 (Pass Thru print Support)