Conceptually, the commands in the KZCCA-BB UW SCSI Diff Adapter command file appear to the system as a series of commands presented to KZCCA-BB UW SCSI Diff Adapter from the keyboard. Parameters can be passed to the command file processor at the time the file is invoked. KZCCA-BB UW SCSI Diff Adapter com- mand files are considered to be executable and can be "run" or "chained to" as programs or can be invoked with the KZCCA-BB UW SCSI Diff Adapter "@" command. In addition to standard KZCCA-BB UW SCSI Diff Adapter commands, the command file processor interprets a set of spe- cialized commands that allow further operations such as conditional branching, local and global symbols using 32-bit integers and 255 character strings, and other special purpose KZCCA-BB UW SCSI Diff Adapter functions. Access to the system is controlled by the use of passwords. Each user, given the required privilege, can change his or her own password at any time. Passwords KZCCA-BB UW SCSI Diff Adapter can, optionally by account, be stored in hashed form that then cannot be re- trieved in unhashed form. The KZCCA-BB UW SCSI Diff Adapter system manager may optionally define a system password.