In the program, only the cursor-keys of the basic module can be evaluated.
In TDE, the cursor-keys and the 4 F-keys are used.

The cursor-keys are only evaluated in the program if the ESC-key is pressed and held and then one of the cursor-keys.

carlosovo

It means that on Web server keys ESC and OK are doing nothing?

In web server they have the same function as by the real LOGOI! or the real TDE. 

For a better understanding, I have created a screen video.

In order for the cursor keys to be effective in the program, the function must be initiated by pressing the ESC key. As you can see in the video, the colors of the cursor keys left / right then are changed.

In the program I have also programmed a message text to be acknowledged.
This message text remains active until the OK key is pressed.

As you can see, the two buttons (ESC + OK) have a function.