Commands {command, computer} {executable command} execute actions, such as login, logout, show user name, or change password.
Commands {execute command} can save data to database, like Commit, and start background processing.
Commands {commit} can save data to database. Commit saves everything since previous Commit command, Rollback command, or application opening.
Commands {rollback} can discard all unsaved data and return to state at previous Commit command or application opening.
Commands can allow user into computer system {login}.
Commands can allow user to exit computer system {logout}.
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Date Modified: 2022.0225