What should be on the page instead? You do realize that in the cgi processing model you send a request to a server and the server sends back some html.

http://search.cpan.org/~greb/Net-NetSend-0.12/NetSend.pm<br
"This module implements a client interface to the Windows Messenger Service" , what is to happen if the person sending the cgi request is not on windows. What should be on the page of html sent back after the server finishes the cgi reqeust?

And that service can be turned off. see http://www.techrepublic.com/article/disable-microsoft-messenger-service-in-windows-xp/]. for more about the service see https://en.wikipedia.org/wiki/Windows_Messenger_service.