This can be done by including the arguments for source and/or sub-source in the link. For example:
  • http://yourdomain.org/site/PageServer?pagename=homepage&s_src=foo&s_subsrc=bar

The values can be any string. Note that if the source or subsource includes spaces, use + signs, e.g.:
  • s_src=BannerAds&s_subsrc=AdonCNNweb+site

In Luminate CMS, depending on how your URLs are formatted, you may need to add a "?" to the beginning of the source code url arguments if a "?" is not already included in the URL, e.g.:
  • http://yourdomain.org/DecemberEvent?s_src=WinterCampaign&s_subsrc=youtube