Common HTML Header across WebPage

Is there a way to define a common HTML Header with IMG tags across WebPages?

WebApplication has a HTMLheader property. Maybe you look for that one?

    AboutLogin

Trying this in App.HTMLHeader and it cannot find LOGO.png, what directory is it expecting to find a project picture in?

In what directory would the app expect LOGO.png to be found? Or does this question not make sense?

relative to the cgi url of course.

and App.HTMLHeader is of course for header tags, not for generic html.
For that you better use the PageSource control.