ncp - a fast file copy tool for LANs

"ncp" is a utility for copying files in a LAN. It has absolutely no security or integrity checking, no throttling, no features, except one:
you don't have to type the coordinates of your peer.

Basically it works like this:

- You and your buddy want to play Quake
- Your buddy has a level that you don't have
- He types npush filename and waits. npush sends out UDP announcement packets proclaiming that someone wants to send something
- You type npoll. npoll waits until it sees one of these packets
- The files are copied with tar over a TCP socket, so permissions and file dates (and if you are root, owners) are preserved
- There are other usage modes. You can also use it like this:

peer1$ ncp
peer2$ ncp peer1 file1 file2 file3
or like this:

peer1$ npush file1
peer2$ npoll peer1