We need a piece of C# code that I can run from a windows service , that will logon a user at the console ( WinSta0\Default ) of the computer, WITHOUT restarting the computer.

Update to make it more cleare: I need a c++ dll or some c# code, with a function that takes username/password or username/domain/password as arguments and then logs on that user at the desktop/console of the computer, without needing to reboot the computer, and without using a remote desktop client. Everything else is just "nice to have" Must have: This must work both on a standalone windows client or server with local accounts, and on domain joined windows client/server with both local and domain users. This should, if possible, be done without the need to install a credential provider ( like [login to view URL] ). If some of the code needs to be written in C++ that is perfectly fine, as long as tested example code on how to call this from C# is added First, nice to have: We need a piece of C# code that I can run from a windows service, that will logon a user as a remote user ( like RDP ). The code does not need to handle keyboard/mouse mapping, since we will be connecting to the session using RDP once the session has started. Why not just use rdp, you might ask. Often we see errors where something goes wrong, or a company policy has "warning dialogs" doing login, that we cannot detect using RDP. So if we can logon the user, programmatically, and then "take over" the session using the RDP client once fully logged in, we can catch all errors and handle them accordingly. If some of the code needs to be written in C++ that is perfectly fine, as long as tested example code on how to call this from C# is added Second, nice to have: We need a piece of C# code that I can run from a windows service , that will logon a user a DIFFERENT user at the desktop of the computer, if someone is already logged on ( user switching ) If some of the code needs to be written in C++ that is perfectly fine, as long as tested example code on how to call this from C# is added Kind of what this guy is asking for [login to view URL] or this guy [login to view URL] This person claims microsoft say it cannot be done, yet it seems it can be done anyway [login to view URL]