Ok, trying to isolate my syntax error. I have re-reviewed the class specs but I am not seeing an issue. I have this:

    allocated = 0
    used      = 0
    db          = "/data/testdb/"
    global      = "STRELPERF"
    
    # Set args to pass by reference
    list = [db,global,allocated,used]

    # exec the class method to get the global size
    res = self.db.run_class_method("%Library.GlobalEdit", "GetGlobalSize",list)

This is the call that returns the failure status of res(0,). The associated error text is :

ERROR #00: (no error description)

Since for other databases that do not contain the global I get the error:

ERROR #308: Global STRELPERF not found.

It seems that code clip is close but something that I am not seeing is missing. Any help would be appreciated.

That is my point of confusion. The 'IsError' method returns a value of 1 which indicates an error. But the run_class_method() is returning valid allocated and used global sizes for the specified global. I am unclear how I am getting valid results and an error. These would seem to be mutually exclusive.