2.1.3 handle_t
The handle_t data type is used to represent an explicit RPC binding handle, as specified in [C706] and [MS-RPCE] section 2. This data type is a predefined type of the IDL and does not require an explicit declaration.
A primitive binding handle is a data object that can be used by the application to represent the binding. It can appear as a type specifier in typedef declarations, general declarations, and function declarations (as a function-return-type specifier and a parameter-type specifier).