Format of VINES Function 0004h/Subfunction 000Fh request block:
Offset	Size	Description	)
 00h	WORD	000Fh
 02h	BYTE	drive number (0=default, 1=A, ...)
 03h	BYTE	reserved
 04h	DWORD	pointer to path specification (drive letter ignored)
 08h	DWORD	pointer to ARL control block (see #03417)
 0Ch	WORD	number of ARL entries (1..5)
 0Eh	WORD	buffer for status (see #03418)