Create notification or message in the inbox

Hi there

I have two questions:

First, is there an API that can create a notification or a message in the inbox?
Second, is it possible to open the Create Client(or the Create Job) wizard programatically? I have a phone system and when an operator answers a call, I would like to open this wizard with the data from the phone system. And if the client exists, the existing client information should be opened.

Thanks in advance for the info.