Project providers are used in many toolkits, both by NI and by 3rd parties. Here are a few examples that exist today to help get an idea of how they can be used:
The LabVIEW Project Provider framework is an unsupported feature of LabVIEW. The only documentation for it exists in this community group, and it is community supported only. While NI has no plans to modify or break the existing APIs, there is no guarantee that all features will work in future versions of LabVIEW. Please use at your own risk.