Hi,
What little documentation is around seems to contradict it's self on this matter. In the ECM Everywhere 10 Admin & Installation guide, it says that this it supports the rendering of webforms. Another post on this forum also seems to indicate that is the case.
However there is also a known issue about being prompted to log into content server when opening web forms (which is my current situation). In most situations the purpose of OTAG is so that Content Server does not have to be web facing, so the user cannot log into Content Server directly.
Cheers