How do you find out the application name when using the CA Top Secret Installation Exit TSSINSTX?
You can use the PRE-INT exit point in the Top Secret installation exit to check the RACF plist during the signon processing.
The exit plist at offset x'48' (TXA#@RFP) points to the address of the address of RACF plist.
Offset x'30' into the racfpl points to the APPL.