What does enable display does?

Please provide the following info (check/uncheck the boxes after creating this topic):
Software Version
DRIVE OS Linux 5.2.6
DRIVE OS Linux 5.2.6 and DriveWorks 4.0
DRIVE OS Linux 5.2.0
DRIVE OS Linux 5.2.0 and DriveWorks 3.5
NVIDIA DRIVE™ Software 10.0 (Linux)
NVIDIA DRIVE™ Software 9.0 (Linux)
other DRIVE OS version

Target Operating System

Hardware Platform
NVIDIA DRIVE™ AGX Xavier DevKit (E3550)
NVIDIA DRIVE™ AGX Pegasus DevKit (E3550)

SDK Manager Version

Host Machine Version
native Ubuntu 18.04

I have already setup my DRIVE Xavier and install the Ubuntu desktop , however in the setup instructions there was another option and I transcribe:

Enable Display.
a.To enable display without a desktop, start the X server as below. See Manually Starting X Server for more information.
$ sudo -b X -ac -noreset -nolisten tcp
$ export DISPLAY=:0
$ cd /usr/local/driveworks/bin
$ ./sample_sfm

What does this do? I don’t quite understand what “enabling display without a desktop” means? What effects does it have and how it compares with using the Ubuntu desktop?

Dear @kansai,
It enables to run GUI application from remote connected host.

You mean VNC?

And does it offer any advantages compared to installing the full ubuntu desktop?

I am thinking of using this option for Xavier B (Xavier A has already ubuntu desktop)

Dear @kansai,
Running Sample_sfm requires opening in a GUI window which was not possible without above steps. Could you check that once and let us know if you notice any issue.