How to prevent others from logging into QQ on my computer

All four methods mentioned above are effective and easy to implement. The prerequisite for using the first method is that a network firewall software must be installed on your computer; otherwise, you cannot close port 4000. The second method is achieved by modifying the file attributes under the QQ installation directory, which includes subfolders and all QQ files, so it takes a long time to modify once. It is also easily visible to others during modification, thus having weak confidentiality. The third method is very practical. Once the Hosts file has been edited, no further action is needed. When you want to use QQ, simply rename the Hosts file to something else, allowing for quick switching. The fourth method is the most ingenious because only your own QQ account can log in, providing great secrecy. This method is highly recommended.