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DEFINE_KEY
	Define a key to execute a DML expression when the key is passed at any INPUT.

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Format
	Define_key keyname [/Gold] dml_expression
	keyname	Any terminator key that is valid for the %ACTION internal variable.
	The given DML expression is interpreted when the key is entered at any INPUT, MENU, PAUSE, or TABLE_EDIT input.

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Example
	Define_key F20 "Spawn"
	! spawn a subprocess when F20 is hit
	Define_key F20 /Gold "Idml " & var
	! perform the idml program name that is
	! contained in 'var' when the Gold F20 key
	! is hit.