1    /ALL

    Extracts all displays. If /ALL is used, do not specify a display
    name. Do not specify /SCREEN_LAYOUT with /ALL.

2    /APPEND

    Appends the information at the end of the file, rather than
    creating a new file. By default, a new file is created. Do not
    specify /SCREEN_LAYOUT with /APPEND.

3    /SCREEN_LAYOUT

    Writes a file that contains the commands describing the current
    state of the screen. This information includes the screen height
    and width, and the position, display kind, and display attributes
    of every existing display. This file can then be executed with
    the @file-spec command to reconstruct the screen at a later time.