>>>[Update] or just GetEnv('SystemRoot') of course
>>>[Update] ah... root drive letter... then Getenv('SystemDrive')
>>
>>Despite the fact that "SystemDrive" does not appear in the list of available enironment variables, it worked! Thanks for the suggestion.
>
>But it does. Just type GETE( in the command window and Intellisense lists it in the dropdown.

Now I feel stupid. I didn't look at what Intelisense was displaying. Thanks for the heads up.