A:AnswerYes. I do some video editing and this works great. In fact there is a built in software that is a pretty useful tool called Cyberlink PowerDirector
A:AnswerYes you can use the HDMI port to use a second monitor. We originally considered this but changed our minds after seeing the actual size and resolution of the screen.
A:AnswerYes. It does not have a modem but it has an Ethernet port. The Ethernet is the cord that is connected and used in every modem. You just have to connect the Ethernet from the modem directly into the back the back of the PC. You can see the port in the 4th picture. It is located right next to the hdmi output port.