view contents of notepad++ tabs simultaneously?

Solution 1:

Like most other tabbed applications, it's as simple as dragging the tabs out of the active application window. When you release the mouse button, Notepad++ will spawn a new window with the tab you just dragged out. Another way to do this is to select the tab you want to break out, and go to View -> Move/Clone Current Document -> Move to New Instance. You can then tile these separate windows as you would like.

You can also drag the tab within the active window to spawn a split-screen view by selecting one of the two "Move to new view" or "Clone to other view" when you release the mouse button after dragging.

Solution 2:

If all you need is a text editor, NotepadTabs will do what you are trying to do. It is freeware.