We have added our own collection of DMS conditions to read the values of cookies, the ASP.NET session object and server variables. These conditions let marketers and developers construct more robust scenarios in DMS and access low level information provided by third party sites such as LinkedIn, Twitter and Facebook.
Some of the things this lets you do is:
- Determine what site referred a visitor
- Read third party cookies
- Inspect the browser identifier of a visitor
The definition for these rule elements can be found in the Master database at /sitecore/system/Settings/Rules/Definitions/Elements/Visit.