If you point at one of the devices and right click on it you should be able to get some Properties about the device. I suspect your computer is learning the wireless environment in your area, that is why it is showing them. > "Why do you think these unknown devices multiplied like this?" > "Basically, on my map I have myself, my two other computers in black, another computer who is not supposed to be there in black, and a whole amount of unknown unmanaged devices with question marks on them." But you are not connected to them, or should not be. There are many wireless networks and if you have a good PC it will show you all that it can find. Your PC may be sensing those devices on adjacent networks and just displaying them as available for you to connect. However, the devices you see may not be on your network. If you have security enabled then you need to look at the password you have used, is it complex enough? There are many good discussions online about securing a wireless network. The manual that came with your hardware will have some information on how to do this. The first step would be to enable security. If you have not set security up this could be why others have joined your network. Any wireless connection should have some form of security enabled and that security is only as good as the encryption technique and the password.
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