[REBOL] [REBOL]hidden variables in objects?

[tim]

I am presently reviewing a presentation on rebol
made by a third party. It is good to see that rebol
is getting some exposure.

I need to verify something stated in this presentation:
Can there be "hidden variables" in a rebol object.

I.E. would these by like private variables/methods
in C++;

I'd appreciate the informed word on this.

Thanks
Tim