how to call cachemgr.cgi ?

Squid users,

Read the FAQ, but it's still a puzzle for me.

How do I call `cachemgr.cgi` if my webserver is on another machine than
Squid ?

Tried copying the cachemgr.cgi executable into my webserver's cgi-bin
directory and entered it as a URL:
Internal Server Error, Premature end of script headers in cachemgr.cgi
(btw my webserver = Apache).

thanks,

--
Richard van Drimmelen                       | email: rdri@nki.nl
System Management Research                  | phone: +31 20 5121899
The Netherlands Cancer Institute, Amsterdam | fax:   +31 20 5121893