Sorry for the delay on this response.
Shared parameters in Revit are native to Revit only and are created by the firm using Revit to assist in the automatic scheduling, tagging, and general "filling-in" of data.
To my knowledge, there is no shared parameter file to be concerned about with respect to SysQue content. Some manufacturers of mechanical equipment will provide a a shared parameter file along with their families because they also provide a copy of a blank Revit schedule to assist the Revit user.
Shared parameter files are independent of whether the software itself is a network or standalone license (to my understanding), but the shared parameter text file is generally stored on a network server so multiple users may access.
Also, shared parameters are one of Revit's most strange and confusing aspects, but once mastered, becomes an amazingly powerful tool to speed up projects.
...until you destroy the file.

So if you are using shared parameters to help you with managing your information in Revit, please be careful with your file.
The shared parameter file is similar to whatever database file CADmep uses to store all the custom user fields for ITMs that can be created (can't remember which one that is).