PCT Program Control Table - defines each transaction containing a list of valid transaction identifiers (transid) where each transaction is paired with its matching program;

PPT Program Processing Table - contains a list of valid program names and maps and whether a current version is in the CICS region or needs to be brought in as a new copy;

FCT File Control Table - contains a list of files known to CICS, the dataset name and status (closed/open, enable/disabled;)

TCT Terminal Control Table - a list of the terminals known to CICS.