MCT

The MCT system initialization parameter specifies the monitoring control table suffix.

MCT={NO|YES|xx}
Valid values are as follows:
NO
is the default and causes the CICS® monitoring domain to dynamically build a default monitoring control table. This ensures that default monitoring control table entries are always available for use when monitoring is on and a monitoring class (or classes) are active. You can generate an MCT with a single-character suffix only for use by CICS because single-character suffixes cause an error when the MCT is processed by DFHMNDUP. If you use DFHMNDUP, make sure that you create your MCTs with two-character suffixes.

For information about coding the macros for this table, see Generating a performance dictionary record using DFHMNDUP.

YES
CICS will load DFHMCT.
xx
CICS will load DFHMCTxx.