Searching Library Catalogues

In my research I need to search variuous library catalogues, (for example The British Library, the Libary of Congress and some University Libraries) and I am wondering if there is a way of doing this within Devonagent Pro?

This should be possible by creating dedicated plugins but only if the websites aren’t completely based on Flash or JavaScript. What’s the URL of the catalogues? And is a login required?

Thanks for this. The two main websites are need to use are: The British Library the latter probably more than the former. no login required for either of them. Any help you can give would be greatly appreciated.