Article 2021 of microsoft.public.win32.programmer.kernel:
Jeff Kenward wrote:
> 
> Thanks Carey, but does anyone have a good example of how to use
> ImpersonateLoggedOnUser.  I thought I could grab a process token using
> OpenProcessToken and then pass that token to ImpersonateLoggedOnUser but
> I keep getting a 998 error.

You need a user token, not a process token.  Call LogonUser() and it
will return a token for the user.  Pass that to
ImpersonateLoggedOnUser().

-- 
Carey Gregory