Function:     GDI_SAVE

Purpose:      Saves image currently displayed.

Category:     DISPLAY

File:         gdilib.c

Author:       K.G. Begeman

Use:          INTEGER GDI_SAVE( GDI_ID )     Input      INTEGER

              GDI_SAVE       Returns zero on succes, negative on error.
              GDI_ID         Display id as returned by GDI_OPEN.

Updates:      Nov 19, 1997: KGB Document created.