Many thanks. My reason is that my students will need to be navigating constantly between three tabs worth of content, all from different links within a given Canvas module. The two external links open new tabs, but students will be keeping a journal within the discussion board (based on their interactions with the external sites), and if their sole Canvas tab is on the discussion board, they won't have access to the module/links they need. I realize that students could simply open up multiple Canvas tabs themselves, but having the discussion board open in a new tab by default would reduce confusion and errors (especially with a large class). Thanks again!