How do I monitor all activity (including keystroke) of all/any computers (Window & Mac) that hit

My wireless network is open and other computers use it. I want to montor them. Is this possible without installing software on their computers?

How do I monitor all activity (including keystroke) of all/any computers (Window %26 Mac) that hits my router?antivirus software

You can install the network management software on any of the one computers (or) you can install mcafee total protection software on one computer you can manage upto ten computers.

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