The Flush Display Update routine flushes any update batching to
    the screen and leaves the update batching in effect.

    Format

      SMG$FLUSH_DISPLAY_UPDATE  display-id

1  –  Returns

    OpenVMS usage:cond_value
    type:         longword (unsigned)
    access:       write only
    mechanism:    by value

2  –  Argument

 display-id

    OpenVMS usage:identifier
    type:         longword (unsigned)
    access:       read only
    mechanism:    by reference

    Specifies the virtual display to be affected. The display-id
    argument is the address of an unsigned longword that contains the
    display identifier.

    The display argument is returned by SMG$CREATE_VIRTUAL_DISPLAY.