These three options in the boot.ini file is a quick way to change the uni/multi proc settings for testing. They work slick for when I do a Poor Man P2V with WinXPE and Robocopy on a NT 4.0 server. Just extract the HAL and KERNEL that you want from the Service Pack file.
/HAL=filename
Allows you to define the actual hardware abstraction layer (HAL) to be
loaded at startup. This switch is useful in trying out a different HAL
before renaming it to hal.dll. This switch is also useful when you want
to try booting between multiprocessor and single processor mode when
used in conjunction with the /KERNEL switch. For example,
/HAL=halmps.dll. This will load Halmps.dll from the System32 directory.
/KERNEL=filename
The /KERNEL=filename switch allows you to define the actual KERNEL to
be loaded at startup. This is useful in switching between a debug
enabled kernel full of debugging code and a regular kernel. It is also
useful for forcing Windows NT to load a specific kernel. For example,
/KERNEL=ntkrnlmp.exe. This switch command will load Ntkrnlmp.exe from
the System32 directory.
/NUMPROC=
This switch sets the number of processors that Windows NT will run at
startup. This will help test out performance problems and defective
CPUs. For example, /NUMPROC=1
