To sync files using the Windows command line you will need to use the xcopy command. The default action of this program is to copy a file or directory from one place to another, but you can give it flags to tell it to sync the files. There are a few flags available (use xcopy /? to see them all) but you will probably only want to use the following:
Rather than use the old connection properties dialog in Windows you can open up a command prompt and use the netsh to set up all sorts of network specific settings. The most useful part of this is that you can create a bat file that will allow you to quickly change your local IP address very quickly.
To see a list of the network connections available you can use the following command.