BASIC COMMAND SET: Includes the most commonly used OS-9 commands. Not included in this set are the timesharing commands and associated files in the SYS directory, all the assembly language development programs and the DEFS direct- ory, and many of the system maintenance utilities. FULL COMMAND SET: Includes all the commands on the standard OS=9 system disk. It also includes all assembly language development programs and files as well as timeshar- ing utilities and files. INDIVIDUAL SELECTION: This option allows maximum flexibility in creating a custom disk. Each command may be selected as descriptors were with the Basic set preselected.