Format of NetWare "Set Directory Disk Space Restriction" request buffer:
Offset	Size	Description	)
 00h	WORD	0006h (length of following data)
 02h	BYTE	24h (subfunction "Set Directory Disk Space Restriction")
 03h	BYTE	directory handle
 04h	DWORD	(big-endian) disk space limit in 4K blocks
		00000000h to remove restriction, negative to set to 0 blocks