I am looking for a way to enable a real batch upload of several files. So I do not just mean several html input fields, where you have to choose one file after the other. But one file selection window where you select several files holding the ctrl key.
Someone told me he has seen this on the web.
I know that this can't be done with the html form upload, so pure PHP/HTML will not be enough, I guess. I just know PHP though

it must be done with some additional activeX or Java program or script, I guess, that probably then just creates a filled html form.
If anyone has a hint where to find a solution for that, or maybe if just someone remembers if he has seen that work on the web somewhere, I would really appriciate.