Multiple chat with diferent users

[Jorge Eliécer]

Hi, i want to implement chat server peer to peer conversations and not
a broadcast, how can i do this? i know that each user has a hostid but
how can i send individual msn with different messages for each online
user.

how can i know if user is online or offline too?

thanks.

[IMP]

I have the same question how can i send a message to a hostid?

[Viet Gamer]

Same question. Plz help us.