To send a tell

[Migerus]

I initially sent this post to "help" section, but nobody answered. May be I 'll get answer here.

Let's say I want to add a "Send tell" button to the target window.
Is there a command to send a tell to a player ?

And another question, I was trying to add "Invite" button to friends page of the community window.
How I would get the name of the selected player?

Thank you.