Not 100% sure what you mean, but let me explain some technical aspects:
The FLASH gallery is technically speaking only a single HTML page with the flash embedded. The gallery navigation happens within the flash interface and pages dont really change. This is how flash works ... The TITLE(meta) comes from your sitetitle setting in the admin. However, Imagevue also appends the specific item that is being displayed to the title. For example, if you are currently in a folder "Istanbul 2009", and your gallery name was "Travel Photography", the title would be:
Travel Photography - Istanbul 2009
[sitetitle - itemname]
Imagevue uses the SWFaddress javascript to dynamically change the site title, although it technically still on the same page throughout the gallery. Doe this make sense?
The HTML gallery is different, as all pages are actually different pages.