Ever find yourself scrolling up and down through a lengthy document to make edits and changes? You can make life easier to some extent using bookmarks, as outlined in this previous post. Another neat trick, however, is to open several instances of your document all at once. You can then scroll each open copy to a different part of the document, and work on them in separate tabs (or browser windows).
Any changes you make in any of the instances of the document will be ‘synced’ by Google automatically.
To open further copies of your document, simply click to open it the required number of times in Drive. Alternatively, if using Chrome, you can right-click on the tab of the opened document and use Duplicate (as many times as you need) to open further examples.
If you prefer to see two parts of the document side by side (and you have enough screen real-estate!) you can drag a tab away from Chrome to move the tab into its own window:
This is particularly handy where long documents have multiple sections, and where changes in one of those sections must be correctly reflected in others.