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  Description
 
    The DelLine procedure deletes an entire line at the row location of
    the cursor in the window. All lines below the deleted line scroll
    up, and a blank line is added at the bottom of the window. The cursor
    remains in its original position. The deleted line cannot be
    recovered.
 
    The new line extends from border to border within the current
    window. DelLine sets all characters on the new line to blanks with
    the current background color.
 
    The current window may be the default window or one defined with
    the Window procedure.
 
    The TextBackground procedure sets the background color.