S is the session variable. You don’t play with that.
C denotes a major tab in the CP. You don’t get to play with that either.
M denotes a particular module.
P usually denotes a page within a module’s CP.
You can also call actions you have specified in the DB with:
ACT=action_id
I don’t know if any of this is actually written down anywhere specific. I’ll have to ask someone and if not maybe we should add that.
Jamie
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