File: scroll_page_up

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SYNTAX: PORK::scroll_page_up([refnum])
	Scrolls a window's display up by one page (i.e. the number of visible rows in the display).

INPUT PARAMETERS
	refnum: (Optional) The reference number of the window to scroll. If no refnum is specified, the current window is assumed.

RETURN VALUE
	Returns 0 on success, -1 on failure.

SEE ALSO
	scroll page_up