Recently Viewed Boards
About Recent Boards
The Recent Boards list includes a maximum total of 20 boards of the boards that the current user has recently viewed.
Recent boards, documents, and workspaces on the My Overview page
Accessing Recently Accessed Boards
You can access Recent Boards by clicking the ProjectPlace logo in the top menu bar, and from the Home view.
See also Find Your Way around ProcectPlace, where it describes recent boards, recent documents, and recent workspaces widgets on My Overview.