From the NannyMUD documentation

LAST CHANGE

2001-08-12

FUNCTION

NAME
        block_changed_shape_hook - 


AVAILABILITY
	/obj/player

DESCRIPTION
	This function is called when the HP or SP of the player
	changes. If this function returns non-zero, you can block
	the printing of this information from /obj/player.

	ARGUMENTS

	block_changed_shape_hook(
	  ({ Hit points,
	     Old hit points,
	     Spell points,
	     Old spell points
	  }),
	  the player
	)


SEE ALSO
        changed_shape_hook in hooks/changed_shape_hook