Important tables in CICS

PPT - Processing Program Table
                Define application programs and BMS maps in this table. We define program names in this table to make CICS to identify programs.

PCT - Program Control Table
                Define TransactionID (1 to 4 characters) eg: "A054" for main program which executes input data comming from front end or other source. Here we give program name and corresponding TransactionID by which this program can get executed.
When user enters TransID on the terminal, CICS checks this table to get the corresponding program to be executed.

FCT - File Control Table
               Define files used in the CICS program.
All the files being used in our programs needs to be registered in this table.

TST - Temporary Storage Table
               Define TSQ's used in CICS program.

DCT - Destination Control Table
               Define TDQ's used in CICS program.

RCT - Resource Control Table
               Define DB2 plan details that are created during the compile and execution of the source program.