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usage: GETARG(packet,[n])

-extracts a command, function name, or argument string from a message
packet. The packet argument must be a 4-byte address obtained from a
prior call to Getpkt()
-The optional n argument specifies the slot containing the string to be
extracted and must be less than or equal to the actual argument count for
the packet
-Commands and function names are always in slot 0. Function packets may
have argument strings in slots 1-15