windows 2k
null pointer assignment 0x00000000-0x0000ffff
user mode 0x00010000-0x7ffeffff
64kb off-limits 0x7fff0000-0x7fffffff
kernal-mode 0x80000000-0xffffffff
windows 98
null pointer assignment 0x00000000-0x00000fff
dos/16bit windows application compatibility 0x00001000-0x003fffff
user mode 0x00400000-0x7fffffff
shared memory mapped file 0x80000000-0xbfffffff
kernal mode 0xc0000000-0xffffffff