Introduction to RPC - Part 1

// File Example1Explicit.idl
[
   // A unique identifier that distinguishes this interface from other interfaces.
   uuid(00000002-EAF3-4A7A-A0F2-BCE4C30DA77E),

   // This is version 1.0 of this interface.
   version(1.0)
]
interface Example1Explicit // The interface is named Example1Explicit
{
   // A function that takes a binding handle and a zero-terminated string.
   void Output(
      [in] handle_t hBinding,
      [in, string] const char* szOutput);
}