In this case it's ADM1. This is not necessarily the first server that you connect to. They cannot be modified. Some applications, such as Windows setup determines the attribute of the file by it's ability to open it. These are the default settings.
Buffers control the number and size of receive packet buffers.
If TCP connections are used sequentially, the number of buffers can be reduced. If several TCP connections are used simultaniously, increase the number of buffers for better performance. TCP stands for Transmission Control Protocol. It works with IP to ensure that packets travel safely on the internet. An example of a TCP connection would be Netscape.