An ExternalForm is just like any other form. It's only difference is that it is allocated on a specific display and can be used for accelerated blts on the particular display.

Upon shutdown of the system ExternalForms will be deallocated from the display and be kept in their internalized form.

	initialize-release
	destroy shutDown

	private
	getExternalHandle setExternalHandle:on:

	testing
	hasNonStandardPalette isExternalForm

	accessing	top
	colormapFromARGB Return a ColorMap mapping from canonical ARGB pixel values into the receiver
	colormapFromARGB: Set the ColorMap mapping from canonical ARGB pixel values into the receiver
	displayScreen Return the display screen the receiver is allocated on.
	rgbaBitMasks Return the masks for specifying the R,G,B, and A components in the receiver

	initialize-release	top
	destroy Destroy the receiver
	shutDown System is going down. Internalize my bits and be finished.

	private	top
	getExternalHandle Private. Return the virtual handle used to represent the receiver
	setExternalHandle:on: Initialize the receiver from the given external handle

	testing	top
	hasNonStandardPalette Quite possible.
	isExternalForm I am an external form but only as long as I'm allocated on a display