they can share internet connection or files or network boot.
Hard Drive
a wireless router
Sure. It is very useful to connect two or three computers together, if you happen to have them. That way, you can share files, share a printer, and share the Internet connection, among others.
You can set up a network. The most simple network consists of only two computers. You can use this network to share files, a printer, or another peripheral device, and an Internet connection.
It is possible to share a printer on a network. For example: two computers sharing one printer while the computers are connected to a home network (local Area Network - LAN). To share files between two computers, mark a folder or drive as shared - search Google on sharing files for more info.
Many processes allow data-sharing, which is when users can share files between two or more computers. Microsoft's SkyDrive and OneDrive, Dropbox, and TeamViewer are all examples of how you can create a sort of network to share files between devices.
Email is an effective method of sharing files through the internet. However, if the two computers are in the same room, (keep in mind that this requires wireless capting capabilities) you can set up an "ad hoc" connection. Which is a temporary and private connection between two or more individuals, and access the other person's computer that way.
Internet Connection Sharing
Just an observation should this information be made public?
The simplest kind of home network contains exactly two computers. You can use this kind of network to share files, a printer or another peripheral device, and even an Internet connection. To connect two computers for sharing these and other network resources, consider the options described below The traditional method to network two computers involves making a dedicated link by plugging one cable into the two systems. Several alternatives exist for networking two computers in this manner:
Two computers