Yes Tux, you need to make it! Everytime I try, it turns out to not work. But this is the closest I've gotten.
How it works:
You set a X and Y coordinates and it will spawn/move a unit at that location by taking the coordinates of the "moving" unit and moving it accordingly.
Why is this useful:
Save locations.
In this map I use a wraith to set the X and Y coordinates that the Ling must be moved to. Moving the wraith should make the ling move to under the wraith, but it doesnt work...