How to tell the difference between a VBscript is run from command line or by clicking it in a window?

Question

All I want to do is differentiate between the program being run by the command line or by clicking the test.vbs file in a window.

If you run the script by typing

Answer 1

i=(instrrev(ucase(WScript.FullName),"CSCRIPT")<>0)

returns -1 if running cscript, 0 if running wscript