Format of REAL/32 Exec Parameter Block (EPB):
Offset	Size	Description	)
 00h	DWORD	-> ASCIZ command to be executed
 04h	BYTE	type of exec
		00h .CMD
		01h .COM
		02h .EXE
		03h .BAT
		04h RSP-type queue
 05h	BYTE	flags
		bit 0: overlay existing program
		bit 1: don't assign console to child
		bit 2: allocate memory for .CMD within parent's memory space
		bit 3: make full banked window available while loading child
 06h	DWORD	32-bit offset to ASCIZ command line
 0Ah	WORD	selector for ASCIZ command line