The Tcl Playground is provided using [CloudTk]. 

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<iframe src="https://cloudtk.tcl-lang.org/cloudtk/VNC?session=new&Tk=Tcl-Playground" style="display: flex; flex-direction: column; min-height : 100vh; flex-grow: 1; width:100%; border: none" allowfullscreen></iframe>
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<<categories>> Tutorial