In the header (=master) we put in all our custom reports I have HTML boxes that do the following:

- Open Cost Model Documentation
Open another (internal) web site, with our cost model documentation
href="https://<OUR INTERNAL URL" target="_blank">
This opens our blog in a different tab. You may be able to have it open in another window, but it could be a browser setting. This is good for our purposes. I did not want users to lose the Apptio window!
- Contact the TBM Office
Another HTML box opens a new email to contact us at the TBM Office:
href="<COMMA-SEPARATED LIST OF EMAIL ADDRESSES>?Subject=Cost%20Model%20Inquiry" target="_top">Contact the TBM Office</a>
Since I don't know much about HTML there might be better options, but these work for our purposes.
@Gustavo Paez @Thomas Bognar