How to show MessageBox before desktop appears?

Question

Windows

Before the user's desktop appears, the MessageBox must be shown. How to do it?

Answer 1

How to run a C# program before the desktop appears?

Put the program in the launch scheduler.

For example, before the user's desktop appears, you need to show the MessageBox

To whom to show? For what? At you the program is shown before there was a desktop - therefore the user has not entered yet - to whom to show?

Answer 2

How to add a message when booting Windows 10 .

Answer 3

Look in windows services. But I doubt that there is a UI. But it will work before logging into the account.

Answer 4

If I understand the question correctly, you can look here: https://docs.microsoft.com/en-us/windows/win32/sec...