You can use special programs or a control panel of your Wi-Fi router. So you need to check who is connected to your wireless network. You can enable encryption for your wireless network, but it does not guarantee that your password will not be compromised, even if you are using a WPA2 security. Your home wireless network can be used by neighbors or other outsiders without your knowledge. How to see who is connected to your wireless (Wi-Fi) network (router) with MyLanViewer Network/IP Scanner
