Seeing as how vista extensions to vc2005 are documented by microsoft as
being "undocumented" and I should refer to newsgroups and such I have
this question:

after downloading and installing the windows vista sdk, what is the
difference between (1) and (2) below:

1) from section 5.2 of the Release Notes:

5.2.1 Headers and Libraries: Using the Windows SDK to Develop Win32 C++
Applications With Visual Studio 2005
In order to utilize Windows SDK headers, libraries, and tools within
Visual Studio 2005, the SDK-provided Visual Studio registration tool
must first be run. The Visual Studio registration tool must run in
elevated administrator mode on a Windows Vista computer. When running
this tool on a Windows Vista machine it must be run for each user.

To run the Visual Studio Registration Tool, go to:

Start --> All Programs --> Microsoft Windows SDK --> Visual Studio
Registration--> Register Windows SDK Directories with Visual Studio 2005.

2) downloading and installing the "Windows Vista Extensions to VS2005"

Thanks. If this difference is explained somewhere that I haven't found,
sorry for the redundant question and please refer me to the published
documentation.

PS: The wording in the Release Notes sounds like it might be more then
just registering environment variables for command line compiling, which
is what, in the past, this "registering" thing was about. Basically, I
don't want to confuse Windows Installer with multiple installations of
the same thing by different installing mechanisms (which, in my
experience, is easy to do and has very bad side effects).

Thanks again.