Simply dismounts drives/volumes by calling the Assign
command for a device and it's volume with the only one
parameter specified.

To dismount a drive by Assign you'll have to call it
both for device (DH0:) and volume (System:).

Dismount will do it for you! You only need to pass the
volume or device name. Dismount will find the lacking
dev/vol name and dismount both (or dismount the device
only, when there's no volume inserted).

Example use of Dismount included :)

THIS SOFTWARE IS PUBLIC DOMAIN  - SOURCE CODE INCLUDED
I TAKE NO RESPONSIBILITY FOR ANY DAMAGE CAUSED BY THIS
SOFTWARE!

jacadcapspoczta.onet.pl
http://jacadcaps.tripod.com

 PERMSSN    UID  GID    PACKED    SIZE  RATIO     CRC       STAMP          NAME
---------- ----------- ------- ------- ------ ---------- ------------ -------------
drwx------     0/0           0       0 ****** -lhd- 0000 Jun 24  1993 Dismount/
-rwx------     0/0        1257    1964  64.0% -lh5- 13e6 Jun 23  1993 Dismount/Dismount
-rwx------     0/0         858    1771  48.4% -lh5- 2782 Jun 23  1993 Dismount/Dismount.e
-rwx------     0/0         480     813  59.0% -lh5- 79e4 Jun 24  1993 Dismount/Dismount.readme
drwx------     0/0           0       0 ****** -lhd- 0000 Jun 24  1993 Dismount/Example/
-rwx------     0/0         366     996  36.7% -lh5- cc97 Jun 24  1993 Dismount/Example/CDFSSelector
-rw-------     0/0         411     654  62.8% -lh5- 4265 Jun 24  1993 Dismount/Example/CDFSSelector.readme
---------- ----------- ------- ------- ------ ---------- ------------ -------------
 Total         7 files    3372    6198  54.4%            Jun 26  2001