You can only pick things up that are meant to be picked up (by clicking) - a boulder would be dragged&dropped into your inventory.
The pointer has to show the description of the item you want to pick up.
Try practising on torches, this was my way of finding out how long the distance range for a valid TK-spell was.
Kiya
Spacejuju, I'm not a native English-speaker either, we've had about 34 nationalities on the old Forum <img src="/ubbthreads/images/graemlins/winkwink.gif" alt="" />, so no need to be shy.