All features of this menu depend on a network link to the Internet, and
Mac: MacTCP software from Apple Computer, or equivalent.
MS Windows: WinSock.dll software from various vendors
Unix: TCP should be standard software
If you have problems in general with SeqPup network functions, make sure that other TCP-based applications work on your computer before reporting the problem. You may need to work with computer support people at your site to iron out general network problems.