how can i interact in windows (xp, vista, 7) welcome screen or locked screen like a VNC or Dame Ware

im trying to make a support software in c#.net like a VNC or Dame Ware and i d开发者_高级运维ont know how to send input event to login or locked screen in windows (xp, vista and 7)

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It has been a while since I have touched C# but here is something to try. If your application is going to run as a system, and can simulate user input. Simply send CTRL+ALT+DELETE keys to the console. That is how VNC/DAMEWARE/HYENA all accomplish the task. Adversely, they are all written in C or C++.

Don't try to interact with LSASS in an api call to unlock the screen. Calling the security subsystem to unlock a screen is supposed to be done by keypress and some A/Vs look for apps trying to do it in other ways.