Hello!

It should be very simple but I couldn't find it in Help  

How can I do so, when an email-address is written in a field of catalog Addresses and user clicks on this field, an email program is opened?

Similarly as in MS-Word for example.

Thank you in advance!

Use OnClick event and code:

RunApp("mailto:example@example.com");

Thanks, Alexey!

It works rather fine, but only in case I change the Email-Address and press enter key. If I only mark this field and then press enter, nothing happens.

You can add, for example, OpenButton with the following handler:

StandardProcessing = False;
RunApp("mailto:example@example.com");

Thank you! It really works!