But I have a complaint to make: Why this application constantly trying to connect with net without user's permission. This is not good. I'm hoping someone here might be kind enough to explain the behaviour and state the remedy.

I assume you are using the latest version (4.5.1). In this version Avro Keyboard tries to access the net to check for update information.

If you want to turn automatic update checking OFF, please follow this procedure:
Go to the Option dialog box
Click on the Auto update Check item of the left list.
Select Manually (When I click Check Now) item in the combo.

From now on, Avro Keyboard will not try to access the net until you check for update manually.

Instructions:

Manually disabling "AutoUpdate" in Avro Keyboard 4.5.1:
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1) Close Avro Keyboard
2) Double click on the "Disable AutoUpdate.reg" file.
3) On the confirmation message, click "Yes"


Auto Update check will be disabled now.



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IMPORTANT NOTE:
You have to follow the whole step EVERY TIME you
make any change in the Option dialog box settings.