IBM SC33-1683-02 - Manual (Page 407)

name4
The name of a 4-byte location that is to receive the current maximum
number of active tasks currently allowed for this transaction class,
expressed as a binary value.
(Rn) A register to receive the current maximum number of active tasks
currently allowed for this transaction class, expressed as a binary value.
PURGE_THRESHOLD(name4 | (Rn))
returns the purge threshold limit for this transaction class.
name4
The name of a 4-byte location that is to receive the current purge
threshold limit for this transaction class, expressed as a binary value.
(Rn) A register to receive the current purge threshold limit for this transaction
class, expressed as a binary value.
RESPONSE and REASON values for INQUIRE_TCLASS:
RESPONSE REASON
OK None
DISASTER LOGIC_ERROR
INVALID None
EXCEPTION UNKNOWN_CLASS
The INQUIRE_TRANDEF call
The INQUIRE_TRANDEF function is provided on the DFHXMXDX macro call. Its
purpose is to allow you to obtain information about the specified transaction
definition. In general, this function call is equivalent to the EXEC CICS INQUIRE
TRANSACTION command, with some differences.
transaction management functions
Chapter 3. The user exit programming interface (XPI) 375