[syslinux] How to press F1 over a serial console?

[Ferenc Wagner]

Hi,

Over a serial emulation provided by the BIOS, I get the PXELINUX boot
prompt all right.  Now, how do I send F1 to get a help screen?  It's
not PXELINUX specific, of course, F1 would also come helpful for
entering the BIOS Setup program.  Its accross telnet running in an SSH
session from an UTF-8 xterm, as it probably matters.  I would be
grateful for any insight.
-- 
Regards,
Feri.