The book "Getting Started 3RD Edition", the Homepage website etc.
When clicking on the highlighted text or a link to another page or external website, they mostly all seem to open in the same window. In order to go back to where you first started, you have to click backwards, which can be a loooong way back (I get sidetracked very easily!). Instead of keeping the page where you first started, and opening in a new window. If you happen to close (X) the window you are in, you loose all that sidetracking, plus the original page.