....You can freely interchange the disk device
     names with logical volume names from DOS,
     BUT you may not have any spaces in the
     volume name if you want to reference the
     volume name from BASIC....




 ....DOS will search the current directory for a
     command before resorting to SYS:C to get it,
     BUT BASIC knows whether or not SYS: is mounted
     and does not bother to even look in the current
     directory on the mounted floppy for the DIR
     command....