INT 15 - DESQview v2.50+ - "ADDINSTANCEDATA" - ADD PER-TASK SAVE/RESTORE AREA
	AX = DE27h
	BX = type
	    0000h process
	    0001h task
	ES:DI -> list of Instance Item Structures (see #00553)
Return: CF clear if successful
	    AX = ???
	    BX = ???
	CF set on error
	    AX = error code???
		0004h invalid BX value
Note:	DESQview 2.50-2.52 are distributed as part of DESQview/X v1.0x.
SeeAlso: INT 2F/AX=DE08h,INT 2F/AX=DE09h


Format of DESQview Instance Item Structure [one element of list]:
Offset	Size	Description	(Table 00553)
 00h	WORD	length of data area DESQview should save and restore on context
		  switches (0000h = end of list)
 02h	DWORDDoubleword; four bytes.	 Commonly used to hold a 32-bit segment:offset or selector:offset address.	pointer to area to be saved/restored