cobalt

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The old Cobalt OS used PCICFG.EXE to detect VirtualBox during installation, and added a text file to the C drive as a variable: RBPCI\PCICFG.EXE -t *|FIND.EXE "DeviceID BEEF" > nul

Then it initialized an internet connection in AUTOEXEC.BAT:

if exist \SYSTEM\VBOX.TXT goto vbox

...

:vbox
LH \SYSTEM\BIN\PCNTPK INT=0x60
SET MTCPCFG=\SYSTEM\NET\MTCPCFG.TXT
LH \SYSTEM\BIN\DHCP
if exist \WINDOWS\SYSTEM\DOSX.EXE goto windowsinfo
if exist \SYSTEM\DOSSHELL.EXE goto desktop
goto end

http://freedos.sourceforge.net/wiki/index.php/Networking_FreeDOS

Helpful: https://forums.virtualbox.org/viewtopic.php?f=4&t=105823