C:\WINDOWS>LOGOFF /?
Terminates a session.

LOGOFF [sessionname | sessionid] [/SERVER:servername] [/V]

 sessionname         The name of the session.
 sessionid           The ID of the session.
 /SERVER:servername  Specifies the Terminal server containing the user
                     session to log off (default is current).
 /V                  Displays information about the actions performed.




C:\WINDOWS>MEM /?
Displays the amount of used and free memory in your system.

MEM [/PROGRAM | /DEBUG | /CLASSIFY]

 /PROGRAM or /P   Displays status of programs currently loaded in memory.
 /DEBUG or /D     Displays status of programs, internal drivers, and other
                  information.
 /CLASSIFY or /C  Classifies programs by memory usage. Lists the size of
                  programs, provides a summary of memory in use, and lists
                  largest memory block available.



C:\WINDOWS>MOUNTVOL /?
Creates, deletes, or lists a volume mount point.

MOUNTVOL [drive:]path VolumeName
MOUNTVOL [drive:]path /D
MOUNTVOL [drive:]path /L

   path        Specifies the existing NTFS directory where the mount
               point will reside.
   VolumeName  Specifies the volume name that is the target of the mount
               point.
   /D          Removes the volume mount point from the specified directory.
   /L          Lists the mounted volume name for the specified directory.

Possible values for VolumeName along with current mount points are:

   \\?\Volume        C:\

   \\?\Volume        D:\

   \\?\Volume        A:\