[Admins]

Yes save[0..9] are variables good especially on
client-side where you don't have with()

Those variables are also sent to the client,
I have used them in the railtracks npcs to
tell the player what kind of railroad track the
npc is.

When changed on client-side its not sent back
to the npcserver though (because the npc is protected
against modifications by the clients)