First of all thanks for your reply. I will look through links your provided.
POE is good idea but the modules is very huge enough to sit in memory constrains applications devices.So i planned to write of my own server and client that suits for my application.
Pblm with select is that its behavior is different for platform like Windows and Linux. One example is, STDIN won't work in Windows with select. This has been explained in Network Programming with Perl by Lincoln D. Stein many years back. Over these years any solution has been found for that or i don't know(If there pls provide link for the same).
I want to design a platform independent server and client. Provide me if any other way of multitasking.without forks or thread(both has drawback as memory usage. Any other go for memory constrain applications.(or only option is select??).