Project Management Tools and Techniques | by Business Management Consultants

Regarding popup blockers and external website links
It is also strongly recommended that you disable any popup blocker software you may have running so that links to external websites and documents, as well as image enlargement functions, are able to work normally.

Use one of the following methods to return from linked sites to the lesson:

Close the new site window. You will automatically return to the lesson, which should continue to be open in a browser window underneath.
If your popup blocker software forces the new site to open in the same window, you may use your web browser's "back button" to return to the lesson.
Minimize the new site window or ALT+Tab to make the lesson window your active window again.

All internal popup links and external website or file links will appear in red. Clicking any red link will most likely result in the attempted opening of a new browser window.