It is used with the syntax mcrt x y.
In Creatures 1, it is described as moving a carrot to x y and moving the camera with it - changing what the player looks at. In Creatures 2, it is described as moving the object to an absolute location and redrawing it, this is different from MVTO in that the object has its limits removed before moving.
In Creatures 1, it can be seen in use in the Grendel Scarer, being used to move the grendel.
It can be seen in use in the C2 Teleporters.