Where can "settings" be stored in a prim?

Bit of an odd question this..........

Say you have a door, and a door script that handles the door movement and access list.

I'm aware some people use a notecard to store names.

But the ones that don't use notecards and "seeminly" magically remember names etc, without the name being in the script or anywhere else.....

Where is this "settings data" held ?

Can it be held in a "string" invisibly within the script and is this data safe?

They are in the script variables. You can't save data in many other places. But that is not bad: a script that is not reset will keep its data and settings even when it's prim is taken and rezzed or detached and attached.

There are a few other possibilities: the object name and the object description do contain data and that goes for all prims in an object

Also the hidden faces of prims can use the color and alpha settings to hold float values, or very short ascii text with appropriate conversion

Do the value of variables persist through a region restart?

Oh thanks.

So once it's rezzed and some data has been input, then as long as you don't reset the script then the data will stay there?

Normally, yes. The big exception is if you set a script to "not running", a sim restart will wipe its memory.