The ability to control your primary machine remotely can come in rather handy when you need to access your documents and applications using your netbook or laptop. While you might be tempted to go with a solution based on the popular VNC protocol, you should keep in mind that it has two serious limitations: it's both insecure and slow. A much better solution is to use the FreeNX server and an NX client, which offers a secure connection that works well even with a slow modem link -- a boon for users on the move.