I'm currently running Xprotect smart client on a windows PC linked to a Husky M10, I have a 3rd party application that works as an overlay on to the cameras which I wish to add and test.How do I link these into the Smart Client, using the MIP plugin?

Analytics Overlay sample might be helpful. Please see this link;

https://doc.developer.milestonesys.com/html/index.html?base=samples/analyticsoverlay_sample.html&tree=tree_1.html