typedef void * RPC_IF_HANDLE;
An interface handle is an opaque variable containing information the RPC run-time library uses to access the interface-specification data structure.
The MIDL compiler automatically creates an interface-specification data structure from each IDL file and creates a global variable of type RPC_IF_HANDLE for the interface specification.
The MIDL compiler includes an interface handle in each .H file generated for the interface.
Routines requiring the interface specification as an argument show a data type of RPC_IF_HANDLE.
The form of each interface handle name is as follows:
For example:
hello_ClientIfHandle
hello_ServerIfHandle
Note The maximum length of the interface handle name is 31 characters.
Because the _ClientIfHandle and _ServerIfHandle parts of the names require 15 characters, the if-name element can be no more than 16 characters long.