These technologies keep unauthorized users from eavesdropping on remote sessions. Access control generally involves physically securing the host machines used for remote access. For instance, the control software might lock the keyboard, mouse, and display or lock the machines in a physically controlled environment, such as a wiring closet. The software can also restrict remote users from accessing specific drives or resources. Detection tells you whether your security system has been compromised, the intruder's access method, the approximate location of the intruder's entry, and other details.
Security logs for remote-access software are a good start toward implementing detection mechanisms.
You should also watch out for viruses. Fortunately, more than 7,000 viruses have b een eradicated thanks to virus-scanning software. Many vendor's sites offer trial or demonstration versions of their software. You can also find a wealth of background information on remote communications.