The Win32 Preliminary SDK for Windows NT provides you with access to the
broader capabilities of the Win32 API with features such as preemptive 
multitasking, multi-threading, 32-bit flat memory model,and security.
By purchasing the Win32 SDK you will receive preliminary and final versions 
of the Windows NT operating system and SDK tools in addition to preliminary 
versions of a C/C++ compiler. For complete system requirements please 
download the the Win32 Preliminary SDK datasheet (SDKDAT.DOC or SDKDAT.RTF 
in Library 1 of the MSWIN32 forum) and the hardware compatibility list 
(0792HW.TXT in Library 1 in the WINNT forum).

The cost of the Win32 SDK with printed documentation is $399. A CD-only version 
containing the documentation in PostScript format is also available for $69. To 
order from within the U.S, please call Microsoft Developer Services at (800)
227-4679. In Canada, call (800) 563-9048. In all other countries, contact your
local Microsoft representative.