[syslinux] constants and line continuation

[Miller, Shao]

Good day Warren,

In regards to your question concerning a constant prefix which is
prepended to filenames in your PXELINUX config-file:

Are you familiar with DHCP options 209 and 210?  As documented in
syslinux/doc/rfc5071.txt, you could potentially make good use of these.
If you set 210 to:

http://webserver/

Then any relative file paths found in any config-files will be fetched
via that prefix.  It should be clear that you are using gPXE, since your
example was expecting to use HTTP.  In that case, you can set DHCP
options from a gPXE script or from its CLI.

Simply search the Internet for "gpxe option 210".

- Shao Miller