Mainframe, MVS and zOS Discussion

The question I was is, how many ways can we initiate a CICS Transaction? Can you list them?

My answer:

1. Keying in the Transaction-id at the terminal
2. By coding the transaction id in the EXEC CICS return command
3. By associating the attention key with the PCT
But interview said that there ...

Hello,

Is it PL/I or PL/1? When I am seaching I find the details about both and people seem to use both. So are they same or different? Can you please tell me?

Hello,

I am a COBOL programmer and have knowledge about PL/I, learningit. Can anyone explain me the null indicator processing in PL/I.