This item was deprecated in version 2019r2. Please use `Thread.Start` as a replacement.
## Description
Executes the thread's Run event handler.
## Sample code
The following example illustrates how to update an interface using a `Timer` and a Thread. The computation is done in the Thread but the interface is updated via the `Timer` in the main thread.
The user interface has a `PushButton`, `ProgressBar`, `Timer` and Thread object on the Window.
The Action event of the `PushButton` gives the `ProgressBar` an ititial value and sets the mode of the `Timer` to Multiple. The `Timer` periodically checks on the status of the `ProgressBar`.
This is the code in the PushButton Action event hander:
``` xojo
ProgressBar1.Value = 0
Timer1.Mode = Timer.ModeMultiple ' periodically check ProgressBar and update the interface
Thread1.Run
```
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The `Run` event handler of the Thread is what calculates the value for the `ProgressBar`. *ProgressValue* is a property (`Double`) of the window.
``` xojo
progressValue = 0
While progressValue < 100 ' if not the Maximum...
' recompute progressValue, a property of the Window
progressValue = progressValue + 1
' do nothing for 1/4 second or so so folks can see the actual progress
Dim waitUntil As Integer = Ticks + 15
While ticks < waitUntil
Wend
Wend
```
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The `Timer` periodically checks the state of the `ProgressBar`. If it has not reached its maximum value, it updates it with the computed value.
``` xojo
If ProgressBar1.Value >= ProgressBar1.Maximum then ' tests the ProgressBar value
ProgressBar1.Value = ProgressBar1.Maximum
Me.Mode = Timer.ModeOff ' turns off the checking/updating
Else ' if not maximum
' updates the interface with the current value that was updated by the thread
ProgressBar1.Value = progressValue
End If
```
## Compatibility
All project types on all supported operating systems.