You can embed external pages by copying the file
and renaming this
and then in the web.config file create a setting with the same key value as the full page name
<add key="mywebsite.aspx" value="http://crmtogether.com"/>
This embeds the page in an iframe within the portal.
- Please note that some sites like youtube will block you from using its content in an iframe.
OCT 2020 To have the website open in a new tab/window you need to add "T=Y" as a quesry string onto the url in CRM