ULONG Flags Option flags (see comments).
ULONG Drive Logging drive ('A'=A: and so on), or zero to disable.
The option flag has two bits of interest:
00000001 - Disable Popups (otherwise enable them) 00000002 - Ignore drive parameter (otherwise use it)
Note: If the Ignore Drive bit of the Flags parameter is set, the Drive parameter must be zero.