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[Netbios is not supported on Windows Vista, Windows Server 2008, and subsequent versions of the operating system]
The ACTION_HEADER structure contains information about an action. This action is an extension to the standard transport interface.
Syntax
typedef struct _ACTION_HEADER {
ULONG transport_id;
USHORT action_code;
USHORT reserved;
} ACTION_HEADER, *PACTION_HEADER;
Members
transport_id
Specifies the transport provider. This member can be used to check the validity of the request by the transport.
This member is always a four-character string. All strings starting with the letter M are reserved, as shown in the following example.
MOOO (All transports)
MNBF (NBF)
MABF (AsyBEUI)
MXNS (XNS)
Windows XP: Certain legacy networking protocols, including NetBEUI, will no longer be supported.
action_code
Specifies the action.
reserved
Reserved.
Remarks
The scope of the action is determined by the ncb_lsn and ncb_num members of the NCB structure, as follows.
| ncb_lsn = 0 | ncb_lsn != 0 | |
|---|---|---|
| ncb_num = 0 | Action applies to control channel associated with the valid LAN adapter. | Action applies to connection identifier associated with the valid local session number. |
| ncb_num != 0 | Action applies to address associated with the valid LAN adapter. | Illegal combination. |
Requirements
| Requirement | Value |
|---|---|
| Minimum supported client | Windows 2000 Professional [desktop apps only] |
| Minimum supported server | Windows 2000 Server [desktop apps only] |
| Header | nb30.h |
See also