I'm posting this question only for those who know about what I'm talking Here it is: I've seen on some web page (http://www.cyberport.com/~tangent/pr...tml#nagle-desc) that disabling the Nagle Algorithm with TCP_NODELAY could make some problems, cause "Even if the sender manages to send its packets individually, the receiving TCP/IP stack may still coalesce the received packets into a single packet. This can happen any time the sender can send data faster than the receiver can deal with it." But if I set TCP_NODELAY for Client AND server, will it be ok? It's very important for my network application to receiving specific packet scheme... And using identifiers will be too heavy...