well its actually fairly easy to boot with a diff screen ... just copy your new kernel ( lets say you call it mykrnl.exe) to the dir ntoskrnl.exe is in .. and edit your boot.ini
you should have something like this:
[boot loader]
timeout=0
default=multi(0)disk(0)rdisk(0)partition(1)WINNT
[operating systems]
multi(0)disk(0)rdisk(0)partition(1)WINNT=\"Microsoft Windows XP Professional\" /fastdetect
just edit it to this :
[boot loader]
timeout=10
default=multi(0)disk(0)rdisk(0)partition(1)WINNT
[operating systems]
multi(0)disk(0)rdisk(0)partition(1)WINNT=\"Microsoft Windows XP Professional hacked logo\" /fastdetect /kernel=mykrnl.exe
multi(0)disk(0)rdisk(0)partition(1)WINNT=\"Microsoft Windows XP Professional\" /fastdetect
then all you need to do is reboot ... then choise the one you want ...
koko

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