I recommend you to use the "network dog" monitoring software, which is very powerful and practical. Our group and subordinate branches are using it! It can monitor the whole LAN only by installing any host in the LAN, monitor the online records, QQ/MSN chat content and email content of all hosts, break through the arp firewall to control the network speed and traffic of any computer in the network, and monitor the screen. Most importantly, it does not need to install any software and programs on other computers, and truly realize "one computer installation, whole network monitoring"!
For the specific download address, you can go to Baidu to search for "official website, a cyber dog"! ! It was developed by Achong Software.