[Grml] nVidia in a boot anywhere system

[Mark]

GRML 0.6-1 and GNOME 2.12 on a portable USB drive.  It must boot "any"
PC.

About installing nVidia.  Is it dangerous for this user scenario?  Will
such a system ONLY boot machines that have nVidia cards, or "any" PC?

List exact steps to get nVidia support.  GRML repository has nVidia
stuff but kernel replacement has me worried.  Better safe than
sorry...so I ask questions.

Thanks for the advice.
Mark