From the NannyMUD documentation

LAST CHANGE

2001-08-12

FUNCTION

NAME
        block_becomepk_hook - 


LOCATION
	/obj/player (from /obj/hook)

AVAILABILITY
	This hook is generally available.

DESCRIPTION
	The hook is called after all the sanity checks have been
	performed, and just before the change takes place. The
	block_becomepk_hook is called first. If that does not exist
	or returns zero, the becomepk_hook is called.

	If the block_becomepk_hook returns 1, the player is stopped
	from turning PK.

	ARGUMENTS

	block_becomepk_hook(
	  ({ time when the player will stop being considered a pk,
	  }),
	  the player
	)


SEE ALSO
        becomepk_hook in hooks/becomepk_hook