What is Pseudo conversion in CICS?

Answer 1

In the early days of computing a program was active all of the time and it loaded up the screen and then sat actively waiting for a response from the user. This response then resulted in either another screen or the program exit. This program is not only big but it is holding onto resource all of the time that it is active.

CICS on the other hand has something called pseudo conversation.
A program starts and displays a screen. The program then terminates. But before it terminates it starts another program or itself to await a response from the user.

This is pseudo conversation because there is not necessarily one program involved. There is also not a conversation because once the user action has been processed and the next screen displayed the program terminates and another program takes on the conversation.
There is usually not one large program but many small modules doing part transactions.

Resources are not held for long periods because of the break in conversation.