On the desktop side, that connection to the PC is limited to a single connection where you remote control the console. The server component of RDP is built into the Windows Operating System whether it is XP, Vista, or Windows 7 (but you must authorize remote desktop to that computer). You can perform remote control from PC to PC, Server to Server, PC to Server, or Server to PC.
Windows Remote Desktop allows you to remotely control just about any windows PC or Server.
If you are interested in using Windows Remote Desktop from the command line, likely you already know what it does but you may not have realized all that you can do with it.