[AccessD] Exit Access with an error code?

Can anyone tell me how to do this? Assume two cases, to be decided upon
examination of a recordset's single row return value. In case one, I want to
exit Access with an error code of [any value you like, other than zero]. In
case two, I don't want to exit until the user actually exits gracefully (in
which case the exit value would presumably be zero).

Suggestions?

TIA,
Arthur