Schedules sending to occur at a time when it is permitted by rate, flow and concurrency controllers,
so that it can be done without excessive buffering.

C# | Visual Basic | Managed C++ |
void ScheduleSend ( OutgoingCallback callback )
Sub ScheduleSend ( _ callback As OutgoingCallback _ )
void ScheduleSend ( OutgoingCallback^ callback )

- callback (OutgoingCallback)
- Callback to invoke when sending is permitted.