From the NannyMUD documentation

LAST CHANGE

2000-12-11

FUNCTION

NAME
        snoop - let one player snoop another


SYNTAX
	object snoop(void|object snooper, object snoopee)

DESCRIPTION
	All data sent to snopee is also send to snooper, if no snooper
        is given, the snoop will be canceled.


NOTE
        Do not snoop people unless it is necessary.