There are different ways: 1.By entering transaction identifier. 2.By START command. 3.By RETURN TRANSID 4.By registering the programs in PLT, they will be automatically initiated during CICS startup. 5.Automatic Task Initiation of TDQ. 6.PF or PA keys could be defined in PCT to initiate a CICS transaction.
Frequently used can be: 1.Using transaction id 2.Using CICS START command 3.Automatic task initiation(ATI).