C)hange: The "C" command will acquire a Library disk for downloading.
Since the Library disks are really private sub-directories it is possible
to have only one disk accessed at a time. When a disk is selected for
downloading, you will be informed of the current selected disk before you
change to a new one. If no change is desired, press the [ENTER] key to 
cancel the change.

A Library disk must be selected using "C)hange" before they are available
for use. Once selected, you may archive the entire disk or download any
or all files on that selected disk.

