Notify the user, how?

I tried UserWarning(messg_hdr, warning_info) — and that is not that I need.
I need just notify the user what has happened, not to ask him whether to continue (like the notification — ‘Record saved x’).
Is that possible to induce from within the module?
I searched through docs and found notify() method form tryton.bus, but didn’t clearly understand what is that.


Well it is complicated to provide help if you do not explain what you did not understand in Sending notifications — trytond latest documentation

I need this type of notifications.

Why is the notify method not a solution?