(1) An on-screen button that is clicked in order to activate a function such as search.
(2) (Go) An open source object-oriented programming language from Google. Styled after C/C++, Go was developed in 2007 to solve Google's own problems orchestrating huge datacenters. It was released to the public in 2012.
(3) A command used on a BBS or online service to switch the user to a particular forum or section. For example, typing go macintosh would switch you to a section specializing in Macintosh computers. Like any command language, you have to know what words to enter.