You'd have to do something like this:
https://vborg.vbsupport.ru/showthread.php?t=228112 . If your non-vb pages are php, then you might be able to include global.php without doing everything that that article shows (if you just wanted the user's group, for instance). But if you mean html pages, then you'd have to create a php page like is shown in that article, and either put in php code to read your html file and return it (after checking the user's group), or else put your html in a template. (I hope this makes some sense - please ask for clarification if it doesn't

)