Yes you can use WiFi to connect to the PC and use the PC App, I use the first 2 methods below, the third should also work
1/ Use the USB cable
2/ Configure GS911 to connect to your home WiFi network, same for PC, note the IP No of the GS911 then open GS911 PC App and in set up enter GS911 TCP/IP No and press test interface, it should find it and you will then be able to use the PC app
3/ Configure GS911 for D2D and connect PC, note the IP No of the GS911 then open GS911 PC App and in set up enter GS911 TCP/IP No and press test interface, it should find it and you will then be able to use the PC app