If you make a lot of use of the objGlobal object then you should look to organizing its use in some way. One way is to divide it up into multiple sub-objects by application or usage.
For example, if you did this in you logon script:
objGlobal.AppA = new Object(); objGlobal.AppB = new Object(); objGlobal.AppC = new Object();
Then in your scripts you could make sure your references do not accidentally interfere with each other.
For example objGlobal.AppA.CurrentCustomer is a different variable to objGlobal.AppB.CurrentCustomer and objGlobal.AppC.CurrentCustomer.