But it was the Preface.
If it is possible in Windows API: please, if I have enabled the option "Always on top" and open the main window — hold the input focus on this window. If I type a search query into Everything — then I should continued to do it. Even if Windows launched a thousand and one program with millions new dialog as IE4 plugins hell in 90s. Even if she wants to ask me something very important (in her opinion). In the beginning I should finished my query and current Everything session, close (or minimize) Everything dialog and only then sorts out all that Windows decided to show this time.
Everything — is best Windows app for everyday use. Thank you very much!
P.S. In my dreams I see realized a Damerau-Levenstein fuzzy search. Sorry I can't help you develop Everything in C.