resID can be either an integer or a string. It is the
id or the name of the 'TMAP' resource to be loaded.
If the map can not be found
then this function will return an error.
Maps can be unloaded from memory
(in order not to use too much at one time) using the command
This command automatically sets
this map to the currently active map. For more information on
current maps see the command Set