Hello
When the user closes the application we want to ask question; "Are you sure you want to close aplication?"
We could do earlier in the 8.3.6 version, we can not do in the 8.3.8 version.

managed aplication module
Procedure; BeforeExit(
We can not open modal form.

Hello, Ali!

By default, in 8.3.8, modal windows are disabled. The reason is that in web browsers you are unable to prevent a user from closing a window. So all exit operation should be performed as fast as possible.

At the same time, you can find examples of how this confirmation can be implemented in 1C:Subsystems Library 2.2.