CGI is an abbreviation for Common Gateway Interface.  http://www.w3c.org/ is one body which proposes and approves standards for internet applications - see [[quote reference]] for CGI related standards.

In Tcl, [ncgi] is a module in [tcllib] that deals with CGI.  Another useful package is [Don Libes]'s cgi.tcl extension.

[[List other useful references - perhaps like Apache's mod_dtcl, etc.]