404. That’s an error.

The requested URL /bookmarks/mark?op=edit&output=popup&bkmk=https%3A%2F%2Fwww.propertytalk.com%2Fforum%2Fshowthread.php%3Ft%3D8643&title=What+does+a+%2B+sign+next+to+someones+name+in+the+online+user+list+mean%3F was not found on this server. That’s all we know.