- PDS is like a folder in Windows if we compare with windows
- PS is like file in Windows if we compare with windows.
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KEYS - Type this at the command prompt to view the default values of the keys
       We can also edit and change the key.
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START - This command is used to start a new screen
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SWAP - To swap between screen, at the command line, give 'SWAP'
       You can also give the default key 'F9' on your keyboard to swap between multiple screens.
       You can also set your own personal key as well. I have set 'F6' for Swap in my machine.
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