Trickles connection; max number of clinet per server; more services

Dear,
I found on web something about Trickles connection. Is there some further reading about Trickles connection in Java? Is that just logical concept or it is language-oriented implementation? If it is only logical concept, I suppose it is equal to TCP connection on client side and UDP connection on server side, of course if that is possibly? Can anyone tell me something more about that? Thank you.
If I am using stateful connection between server and client, what is average number of client which server can serve - you can specify some PC configuration and give number which depends on that PC? Thank you.
If somewhere are more services which should communicate, but they are on a same PC (suppose all are written in Java). What is the best way of communication between themselves?
If you can, recommend me some very good book which can give me at least one answer on my questions. It is better, if book is available as e-book.

It's not supported in Java so you're asking in the wrong place.

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