If it's A, Xinjian B can tell. B has built a, which means that A and B have not formed a local area network. If you want to build a local area network, you can usually turn off the firewall. This can be searched online. When both parties can see it, it means that A B has directly become a local area network. At this time, it is generally possible to enter, if not. The problem may be the file problem of CS 1.6. A B's CS 1.6 may be the same registry file, or there may be no registry file (this is uncertain). If it is CS 1.6 of an Internet cafe, there will be a "Internet cafe installation" registry file. Click to join the registry, and you can do it (both machine A and machine B are injected into the registry). If the personal client finds the file by itself, click the registry to insert it. (You can also open the Frozen Throne (3C) and modify the port information (different) to see if you can join. If you can join, you will form a local area network. If there is a problem, it is also a problem of CS. The home edition of WIN7 system can't establish a local area network, because there is no working group, and it must be the flagship edition of WIN7. (If it is to modify the local area network established by the working group). "I hope my personal experience will help you."