The Participant Portal was established, at the beginning, for the EU Research & Innovation Programme (Horizon 2020) only. Other EU programmes joined later, and now the new Funding & Tenders Portal will host all centrally managed EU programmes in one location. In addition, it will cover calls for tender and the related procurement contracts.
You can continue using your existing username and password. You will find all your assets that you had in the old portal and all functions for managing them.
Today, the new portal covers about 15 EU funding programmes (i.e. there are still programmes managed in other places). By the start of the next EU Budget period (2021), the portal will cover all centrally managed EU funding programmes.