sensor() and adjancent sims

when llSensor(...) triggers sensor() and the detected object/avatar is in an adjacent sim two things seem to go wrong.

1. The object is only detected once every 6 seconds.
2. The object's position can be detected with llDetectedPos() but its sim cannot be. llDetectedSim(num) or llDectectedGlobalPos(num) needed?

How can i determin the distance between 2 objects in adjacent sims?

1) Compare llGetPos and llDetectedPos.
2) If llVecMag(llGetPos() - llDetectedPos(#)) > 96...
3) ... they're in a different sim and need different calculations. Check X and Y separately to see where.

This only works because sims are larger than 192m (256 or so total). But... it's still useful.