Is there a command to show up a small window when a copy operation has been finished?
As I post before I use some usercommands with automated copying but the copy progress windows doesn't appear (it appears when using them in a normal button). Now I have lost some files (maybe closed DO to fast, I don't know) 
I never saw a command like that in the manual. Maybe you should send a feature request, since it would make sense. Also it´s not clear, if closing Opus while copying would cancel the process (i didn´t try that, though).
Running a user command that uses @confirm or one of the {dlgstring}-like codes might do it.
If not you could use a small VBScript that called MessageBox, or a small util which did something similar.
Contacted support, thanks for help