Format of WEB AES Event Control Block:
Offset	Size	Description	)
 00h	DWORD	link address
 04h	WORD	ESR address
 08h	BYTE	InUse flag
 09h	BYTE	completion code
 0Ah  3 BYTEs	reserved
 0Dh	WORD	timeout
 0Fh	BYTE	IgnoreExtra flag
 10h	WORD	PSP
 12h	DWORD	DTA
 16h	WORD	AX value for DOS critical information
 18h	WORD	BX value for DOS critical information
 1Ah	WORD	CX value for DOS critical information
 1Ch	WORD	DX value for DOS critical information