Answer Posted / vindhya viswam

When a Transaction entered on terminal TCP(Terminal Control
Program) recognizes the incoming data from terminal and
makes an entry on TCT(terminal Control Table) and validates
the Terminal.
SCP(System Control Program) acquires storage for the
Terminal data.
TCP places data from terminal into terminal I/O Area (TIOA)
and Identifies the Task.
KCP(Task Control Program) obtains transaction identifier
from TIOA.
KCP thru PCT(Program Control Table) searches for the
application program linked with the Transaction .
If any program is linked with the the transaction then
system will make an entry on PPT(Processing Program Table).
PCP(Program Control Program), with PPT, resident address of
program is obtained.
If any files are associated with the program then make an
entry on FCT(File Control Table).
If any DB2 table is associated with the program then make
an entrynon DCT(Destination Control Table).
Thus the Application Program starts processing –
transaction is initiated.

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