ASSIGN [logical name:] [directory] [ADD|REMOVE|DEFER|PATH]

* ASSIGN will assign a logical device name to a disk directory.

eg.     assign z: df1:zshell_source
  Now if you do a DIR Z: you will get a directory of df1:zshell_source.
  Similarly, the default device names can be reassigned.
eg.     assign libs: df1:libs

* Typing ASSIGN with no parameters, will list the current device
  assignments.
eg.     assign

* Only for OS2.0+:
 "ASSIGN name: REMOVE" or "ASSIGN name: dir REMOVE" removes that assign
 "ASSIGN name: dir ADD" assigns multiple dirs to name:
 "ASSIGN name: pathname DEFER" will become a normal assign when accessed
  the first time. So you can assign to a path that does not exist yet.
 "ASSIGN name: pathname PATH" assigns to a path. Similar to DEFER, but
  will not converted into a normal assign. If you have "assign bla: df0:
  path" and do "list bla:", you will get the directory of the disk
  inserted NOW (!) in df0:.