The CGI-wrapper can be used to run certain CGI programs with a different userid then the webserver's userid. To function properly, the CGI-wrapper binary needs the su-bit. To prevent abuse, it has the necessary security checks. The CGI-wrapper can only be executed by the Hiawatha webserver. It uses the Hiawatha PID-file for this verification.
Normally, only files inside the WebsiteRoot will be executed. CGI-handlers are usually not inside this directory. Use this option to specify binaries that are outside the WebsiteRoot and the CGI-wrapper is still allowed to execute.