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Slot protection

Each slot also has a state which offers three levels of protection: occupied, protected and save. The corresponding commands to set this protection are:

• PROTECT makes the slot `write' protected, so that the contents can't be modified, but may still be deleted.
• FREE removes the protection from a slot, to leave it `occupied'. Any operation which is going to alter the contents of a slot requires the slot to be unprotected.
• SAVE flags a slot to be saved on exit from the program. In fact, this is not an automatic procedure: the user simply returned to the main prompt and is informed which slots are flagged to be saved.

In each case the /ALL qualifier can be used in list mode to apply to all the ßs in the rather than just the current.