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There are some rules concerning the use of user co-ordinate system that should be clearly stated here in order to prevent a possible confusion.
Each graphical window can have a different UCS. The UCS can be assigned to a particular window from the UCS manager.
Select the graphical window you need to associate with the required UCS.
Open the UCS manager.
Select the required UCS.
Close the UCS manager.
If a UCS is edited in the UCS manager (i.e. edited numerically), the changes are made to the UCS that is being edited.
If a current UCS assigned to a particular window is edited by means of a function for modification of UCS, IT IS IMPORTANT TO KNOW that:
Before the modification itself, the window is associated with the default (called current) UCS.
The modification is made with the current UCS.
The current UCS is let associated with the window.
If a named user-created UCS was associated with the window before the modification has been performed, that UCS remains unchanged.
If a named user-created UCS should be modified using modification functions, the following procedure must be executed.
Use modification function or functions to define the UCS as required.
Call function for storing of the current UCS.
Rewrite the original named user-created UCS with the newly defined one.