Miscellaneous Things You Need to Know About Macs
You can share files via File Transfer Protocol (FTP).
FTP (File Transfer Protocol) sites are usually set up by companies or individuals to make it easy to exchange sizable files over the Internet, typically but not exclusively video or picture files. The Mac has a built-in file server for giving other folks access to your machine.
To grant such access, choose Apple→System Preferences and click Sharing. Select the File Sharing check box and click Options. Click Share Files and Folders Using AFP, which is shorthand for Apple Filing Protocol.
People on other Macs can now share and copy files to and from your machine. You might also have to open ports in your router’s software to allow access.