File: scroll_by

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pork 0.99.8.1-2.1
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SYNTAX: PORK::scroll_by(lines, [refnum])
	Scrolls a window's display by the specified number of lines.

INPUT PARAMETERS
	lines: The number of lines by which the window will be scrolled. A negative number will cause the display to be scroll up. A positive number will cause the display to be scrolled down.
	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 by