This one-liner in you Apache httpd.conf file allows you to run both the Apache Web server and Domino on the same system - and have all your requests (be it for html or nsfs) received on port 80.
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The Apache server should run on port 80, and the Domino server on some other port (10080 in this code example)
#Redirect all nsfs to Domino HTTP Server on port 10080 RedirectMatch /(.*).(nsf)(.*) http://localhost:10080/$1.$2$3