[syslinux] How to enable F12 key to start PXE boot?

[Greg_Chu at Wendys.com]

my pxelinux.cfg folder has one file called default show as below:


default boot
prompt 0
say booting....
label boot
kernet memdisk
append initrd=boot.imz

I am using MS remote boot service, and uses pxelinux.0 as the  boot 
program, but I want to enable F12 so end user can skip PXE if no need to 
boot from PXE, whenever needed just press F12 to boot into PXE to restore 
images.

I posted earlier, and got confused by startrom.com and F12, if I use 
pxelinux.0 then I do not see F12 prompt, if I use startrom.com then it 
does show F12, but when press F12 it is looking for winnt.sif, ...

Anyway, some people replied, but I think if I use startrom.com them how do 
I link startrom.com to start pxelinux.cfg default? put it into winnt.sif?

Please help.

Greg