Q1. When Sharepoint is set to multi-authoring, and two or more people are in the document you can see all the content and if someone makes a change to any paragraph (including a check box in a paragraph) then other users will see visually that that paragraph has been changed and it is locked. You won't be able to see that change until a) that person saves the files which writes their change to Sharepoint and then b) you save to write your changes to Sharepoint AND download the saved changes from others.

Q2. Only if everyone saves regularly.

Q3. As Charles says, if you won't allow macros then you will need to use the GoTo command and pick the bookmark (or go to a specific page number).

__________________
Andrew Lockton
Chrysalis Design, Melbourne Australia