Screen casting for teacher?

... screen to all my students. All PC have windows 7 and only local LAN ( no internet)Please tell me how I cast my screen to them or:... screen to a

... screen to all my students.
All PC have windows 7 and only local LAN ( no internet)
Please tell me how I cast my screen to them

or:... screen to all my students. All PC have windows 7 and only local LAN ( no internet)Please tell me how I cast my screen to them

or:You will need internet, but Blackboard or Google Hangouts will do what you want with the screen share. Google Hangouts is free and I think Blackboard is.

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