This trick can be useful if you want to debug user permission issues with a Windows NT service that logs on under "Local System account" (the default).
First, figure out your current system time:
The current time is: 6:15:18.57
Second, use the 'at' command to start an interactive command shell when the next minute starts:
C:\>at 6:16 /interactive cmd
Now inside this new command shell, try your command which is run under this new user.