This can be very useful if you are selling or giving your old computer to someone else. After you get through playing around in that window, close it. Chances are, many of you have been here before. This section is a common destination when your friendly telephone tech support person is troubleshooting your bad or slow connection to the Internet. In the top section, you will see a list of all the modems in your systems.
Most people just have one.
I usually turn this all the way down. By the way, if your tech support person had you go into this area and make some changes, please do not make the changes I suggest. Your system may need those settings in order to communicate with their modems. Your tech support person knows your system better than I do. It is pretty standard and usually requires no tweaking.