If version control is on for a particular file (see the FileAlter command, operand VersCtl), when the file is saved or checked in, the old file is copied to the version directory (the file's directory appended with "\Version").
At any given time, any number of prior versions of a file may exist in the version directory. Each version in the version directory is assigned a unique number between 1 and 9999 The version number is appended to the file name to form a unique file name for the version file. Version numbers increment by one with each version.
A file can be restored to its most recent prior version by invoking the FileUndo command. The file can be restored to the version before that by entering the FileUndo command again, and so on.
A list of all available versions is provided by the FileInquire command. A version can be displayed by invoking the ContextList command while the cursor is positioned on the version line. Unneeded version(s) can be deleted by invoking the ContextDelete command while the cursor is positioned on a version line or while a selection of version lines is active.