How TeamViewer and other remote control software simulate the Alt-Ctr-Del keypress, also known as the Windows Secure Attention Sequence (SAS)?
SendInput
does not work for Alt-Ctrl-Del, neither if it is sent to winsta0\winlogon
desktopPostMessage(HWND_BROADCAST, WM_HOTKEY, 0, MAKELONG( MOD_CONTROL | MOD_ALT, VK_DELETE));
- nopedriverquery
that the run-only Team Viewer does not install drivers.So, any idea how others do it?
The Internals of SAS implementation gives a good overview of what it is happening behind the scenes.
I found out, that there is an undocumented Secure Desktop LRPC Interface aka. Winlogon RPC Interface used by the Windows components themselves and some third party libraries as well. Here is everything I got about it:
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