[dba-Tech] terminology C#

[Susan Harkins]

I'm editing a book on C# (copy, not technical, I'm not familiar with C#) and
the author is using the word "tell" when discussing concurrent messaging: 

You can tell an agent a message...

... so you can't compose tell operations... 

Now, if tell is correct within the content of the terminology this language
and its developers use, it's acceptable. Otherwise, I want to change tell to
send -- does anyone know if "tell" is how these guys express this? I was
okay with changing until I read the second example and now I'm not so sure.
I have no contact with the author and want to avoid forcing someone else to
contact him on this if possible because I haven't the specific knowledge to
know better. It's made it all the way to me, so I'm assuming it's technical
in nature or someone would've noticed it by now. 

Susan H.