Is it possible to view one file in a new window in intellij-idea?

Question

What I actually want to do is to view different files in a some project on different screens.

If they are in different windows, I can easily drag one window to another screen.

It's fine if there are other ways can do this. I'm using windows7.

Answer 1

You can drag the editor tab to another screen and it will open in a separate window. See the Detaching Editor Tabs help section for details.

Shift+F4 does the same:

The shortcut can be changed here:

Answer 2

You have to add a new keyboard shortcut in your keymap.
The action is called Open In New Editor Window

Then when searching for a class using Ctrl + n (go to Class...) or Ctrl + e (recent files)
instead of opening the Class in the same window by pressing Enter
you can open it in a new window using your own keyboard shortcut (Shift + Enter in my case).