NAME
	query_valid_force - check permission to force.

SYNTAX
	int query_valid_force(string s) { ... }

DESCRTIPTION
	When command() is called with 2 arguments, this function is called
	to see if the object that called command() (which will be
	previous_object() in this function) may force you to do the command
	s. If not, this function should return 0. Note that if there is no
	query_valid_force() in your object, all forcing is allowed.

SEE ALSO
	efun/command, efun/add_action