Communication between python scripts

[Chris]

Is there a preferred method for having different scripts on different 
computers communicate with each other?

For example, script A could tell script B that it is done with a certain 
process.

I know how to do this using e-mail, but I would like a more direct 
method if possible. If my ISP's mail server goes down, for example, I 
don't want my processes to come to a screeching halt.