@enrique said:

........also on the user cordinate system and how it relates to the world coordinates and can i revert to a ucs or the wcs or toggle them ?....

Enrique,

Say you save the default SU axes setup in Scene1
You can now translate and/or rotate the axes as an orthogonal set to a new origin/direction.
Save this in Scene2

You will now be able to toggle between the two systems.
Also moving objects absolutely by using [x,y,z] is related to the current UCS, not to the WCS where SU starts from. Unless it is the current one.

So moving a selection by clicking on a point A to start from to [3m,5m,7m] will place point A (taking the selection with it) in x=3m,y=5m,z=7m of any rotated/translated current orthogonal system.

The same applies to relative movements: <2m,7m,3.25m>
A2 is relative to A1 by x=2m,y=7m,z=3.25m measured along the current axes
It works in SU7 and SU6.

Wo3Dan