Which SDK editions differentiate Pocket PC and SmartPhone devices?

[Hillbilly]

Windows Mobile for Pocket PC Phone Edition
now known as Windows Mobile 6 Professional

Windows Mobile for Smartphone
now known as Windows Mobile 6 Standard

Q: Is it sound to presume that Mobile 6 Professional and its support for
Pocket PC can also be used to target SmartPhone devices generally programmed
using Mobile 6 Standard && using Mobile 6 Standard therefore only supports
targeting Smartphones and only Smartphones?

Q: Has the use of XHTML-MP and ASP.NET Web Forms now superceded the use of
the Mobile Controls?

Q: Which is the client in these devices? A version of IE and Trident?