id( - OLE Programmer's Reference (ole.hlp)

id(

Identifies the DISPID of the member.

Allowed on
Method or property in an interface or dispinterface

Comments
The num is a 32-bit integral value in the following format:

Bits	Value
015	Offset. Any value is permissible.
1621	The nesting level of this typeinfo in the inheritance hierarchy. For example: interface mydisp : IDispatch The nesting level of IUnknown is 0, IDispatch is 1, and mydisp is 2.
2225	Reserved; must be zero
2628	DISPID value.
29	True if this is the member ID for a FuncDesc; otherwise False.
3031	Must be 01.

Negative IDs are reserved for use by OLE Automation.

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