Creating windows on the lock screen

Question

https://learn.microsoft.com/en-us/windows/win32/winstation/desktops
I referred to this information, using EnumDesktopsA and EnumWindowStationsA functions did not find the ScreenSaver desktop. After various tests, I found that the lock screen interface was built on the Default desktop, a window of LockApp.exe. But how can I create a window on the lock screen desktop?
I tried to use SetParent but to no avail.
I can create windows on the Winlogon and Default desktops by specifying STARTUPINFO.lpDesktop, but I can’t create windows on the lock screen anyway.

original:
我参考了这篇资料，使用EnumDesktopsA和EnumWindowStationsA函数并没有找到 ScreenSaver桌面，经过各种测试发现锁屏界面是建立在Default桌面上，LockApp.exe的窗口。但是要怎样才能在锁屏桌面上创建窗口呢？
我尝试使用SetParent但是并没有效果。
我通过指定 STARTUPINFO.lpDesktop 可以在Winlogon和Default桌面创建窗口，但无论如何都无法在锁屏界面上面创建窗口。

Answer 1

An application that has been manifested with "uiAccess=true", signed and installed in a secure file system location (e.g., C:\Program Files..., C:\Windows\System32) can display windows that appear over the lock screen image. For example,