TSO and ISPF

TSO :

• It stands for Time Sharing Option. 
• It provides command-line-interface to zOS.
• It fulfills the similar purpose to Unix login session.
• Time sharing means many persons can access the operating system concurrently. 
• TSO commands can be embedded in REXX execs or CLIST, which run interactively or in batch.
• It provides a text editor, batch job support and debuggers.
• It provides facility to submit job and store datasets via computer's operating system

TSO Login Screen

 ISPF:

• It stands for Interactive System Productivity Facility.
• It is frequently used to manipulate z/OS datasets.
• It provides terminal interface with a set of panels.

ISPF Sceen

ISPF FUNCTION KEYS

PF 1 = Help
PF 2 = Split the session
PF 3 = End
PF 4 = Return
PF 5 = Rfind (repeat last find)
PF 6 = Rchange (repeat lst change)
PF 7 = Move Backward
PF 8 = Move forward
PF 9 = Switch between screens during a split session; goes with PF 2
PF 10 = Move left
PF 11 = Move right
PF 12 = Retrieve