>>>>Maybe I lead you into confusion, Tore. You said "if you want to replace the running program", and I clarified that I never wanted to do that, because I know it cannot be done. I want to replace a program that calls another, not a program that is running. The caller is the main program, it's the callee that will perform the replacement.
>>>>
>>>>I thank you for all your remarks.
>>>
>>>So to use my earlier terms, you want the "main" program to replace the "loader"?
>>
>>Antonio wants to launch Updater from the main program and quit the main program. The Updater will replace the main program and start it again.
>
>OK. Wouldn't this pseudocode work:
>

*Main.exe
>Shellexecute Updater
>quit

>

*Updater
>Do killMain && Sergey's code to make sure that Main.exe is removed from memory
>Copy file newmain.exe to main.exe
>Shellexecute Main
>quit

Yes, this sums it quite well.