Console
When the event-loop is running, you can use the console for quick tests.
To load the Tk extensions, enter
(require-extension tk) (start-tk)
Enter this command:
(tk/console)
The console appears.
Start the event loop:
(event-loop)
You can input your commands. With the enter key, the result appears.
If the cursor is not in the last line, with the enter key, you copy the actual line to the last line so that you can evaluate it.