Debugging Windows Remote Installation Services (RIS) can be
problematic. Here are some assorted notes on the process:
Getting hold of the files
=========================
Add/Remove Windows Components -> Remote Installation Services
Files will be placed in \windows\system32\reminst. Copy them out to a
TFTP server. Configure DHCP to hand out startrom.com.
Getting past the "Press F12" message
====================================
Passing F12 through to the guest machine is difficult. It's easier to
patch the startrom.com binary to accept a different key. Open
startrom.com in a hex editor, search for the hex string
6681fb00860000, and replace it with 6681fb66210000. startrom.com will
now accept the "F" key instead of "F12".