Cello was an early graphical web browser for Windows 3.1, developed by Thomas R. Bruce of the Legal Information Institute at Cornell Law School, and released as shareware in 1993. While other browsers ran on various Unix machines, Cello was the first web browser for Microsoft Windows, using the winsock system to access the Internet. In addition to the basic Windows, Cello worked on Windows NT 3.5 and with small modifications on OS/2.