* When you want to create one, this is how you do it.

	pha
	pha
	PushWord #offscreenWidth ;width in pixels
	PushWord #44	;height in pixels
	PushWord #2	;depth in bits/pixel
	jsr	GetOffscreenPort
	PullLong OffscreenPortPtr

* When you want drawing to take place in the offscreen port, simply do a
* SetPort (OffscreenPortPtr).
