How to make Adobe Reader 9 open PDF's in new window?

Question

Now when I open two PDF's its opened in the same window and in two tabs. this is very annoying.

how to make it open in different Windows?

P.S. I would like to do it on Windows XP and on Ubuntu.

Answer 1

This works for me on Ubuntu 10.04:

acroread 1.pdf & acroread -openInNewInstance 2.pdf