I'm almost positive that you'll have to have the desktop client installed to use the API. What are you trying to do that would leverage Web2?
I am looking to build a custom user interface that includes document search and access which would be the Web2 portal, but I would rather the Web2 portal not push the users to a different set of windows except for the final document including the log in screen. Having users exit what they are doing to interface with the current Web2 portal is not efficient.
No, I'm afraid Web2 in this stage neither provides API nor extension (plugin) capabilities.