Getting a Windows OS from Microsoft you have also gain a unique opportunity to connect to your PC remotely from other PCs. This remote desktop connection solution is installed on a PC by default. Although being rather convenient to allow remote administration some companies or even private users see this remote access option to be unsafe due to security reasons.
Being an Administrator or a person with Admin rights of a computer that is placed near you you may keep your eyes on a ball of its security. But if you have several PCs located remotely I'm sure you are really concerned about the security.