The Event Loop
| Async | Handle asynchronous events |
| CrtTimerHdlr | Call a procedure at a given time |
| DoOneEvent | Wait for events and invoke event handlers |
| DoWhenIdle | Invoke a procedure when there are no pending events |
| Notifier | The event queue and notifier interfaces |
| Sleep | Delay execution for a given number of milliseconds |
| Thread | Tcl thread support |
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