How to wrap a custom header/footer around the jazz pages?

Is it possible to put a wrapper or custom frame around the pages served by JTS so I can e.g. add branding or add  permanently visible link to e.g. process guidance or project status?

What I want is when someone accesses my RTC server is that there is a band across the top of the web page saying 'go here for our process guidance', and maybe at the bottom a link to server status, notices about outages, etc.

Is this possible/easy?