INT E0 - REAL/32 - "P_CHAIN" - CHAIN PROCESS
	CL = 2Fh
	[DTAsee Disk Transfer Address] = ASCIZA NUL-terminated ASCII string.	The ASCIZ string "ABC" consists of the four bytes 41h, 42h, 43h, and 00h.  Unless otherwise specified, maximum lengths given in the interrupt list do not include the terminating NUL. command line for process to start
Return: AX = return code
	    0000h successful
	    FFFFh failed
	may destroy SI,DI???