Category: <b>non-traditional input devices</b>
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<pre><b>INT 66 - PenDOS - PKEYUS - SET ???</b>

	AH = 41h
	BX = ???
	CL = ??? (08h-20h)
	DL = screen column??? (&lt;= 50h)
	DH = screen row???  (&lt;= 3Ch)
Return: AX = status (0000h successful, 0001h error)
Note:	this function also sets an internal flag
SeeAlso: AH=42h,AH=43h
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