Name: userp - query if an object once had a network connection or not

Synopsis:
	status userp(mixed)

Description:
	Returns true if argument is an objectp and it is or was
	interactive (that is, had a socket connected to it.. typically
	a player or wizard, but also some internetworking daemon).

Return value:
	It returns 1, if the object is or was interactive, else 0.

Note:
	For those who know about the internals of the gamedriver:
	The flag O_ONCE_INTERACTIVE is checked.

See also: efun/interactive, efun/intp, efun/stringp, efun/pointerp, efun/objectp