hello guys,

i know very little about network programming. i have some basic questions,

i'm using a school machine, which has no public ip address. i'm wondering how to send things from a machine that is outside the local network to the machine inside the local network.

i tried some program, they don't work, for example, the chat example enclosed with QT4, and a remote control tool.

but some other softwares work, for example MSN and emule.

i read some material about how to write a simple network program, they all seem to be easy, but none of them talking about the situation that the machines are in different local networks.

i guess this is a stupid question.

thank you