RAT_COL() Current mouse column

 Returns :
 <nRow> => mouse column right now

 Syntax :  RAT_COL()

 Description : This gives the CURRENT mouse column

 Examples :   
   ? "Mouse is at column :",rat_col()

 Notes:
 This is different from RAT_COLL() or RAT_COLR() in
 that these two functions return the recorded column when the
 mouse button was last pressed, (RAT_COLL() for left or
 RAT_COLR() for right).

 This function tells where the mouse is right now.

 Source: S_MOUSE.ASM