Assuming "player=my;" :

Code:

---

panel PlayerLocPan
{
	digits(10,10,6,*,1,my.x);
	digits(10,30,6,*,1,my.y);
	digits(10,50,6,*,1,my.z);
	flags = visible;
}  

---

Would show the players coordinates in the level at all times. Not hard to map the visibility of the panel to a key.

Hope that helped!