@julio I think we have two questions with your post.
Can I configure to boot into fog without changing the bios options each time? If you have dell computers, you can use the dell program “command and control” also known as CCTK to change bios settings. One that may help you is pxe boot at the next reboot. You would send this command as a FOG snapin to run the cctk program to tell bios on the next reboot, pxe boot. This way you can get to FOG.
I want to deploy an image without registering the computer in FOG. Can I do this? Yes. This is how I deploy my images today. I have a technician sit in front of computer and power it on, press F12 to get to the bios boot menu and then pick pxe boot. In the FOG iPXE menu I pick Deploy Image and select the image to send to the computer. I don’t use FOG to rename the computer or connect to AD so once the image has been pushed to the target computer, the windows installer does everything to connect and setup the machine. This process I call is “load and go”. System builders use this method because they build the computer once and sell it, there is no need to register in fog unless you need to manage the computer after imaging.