Button to close a popup

If you're opening an external website like an Intranet site, then I would just have one button that opens the site and provide some kind of instruction (text) above the button explaining that the site will open in a separate window and to close the window to return to this course. (i.e., Click the button below to open "This Intranet" site. THe site will open in a separate window, simply close the window to return to this course.).

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