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"box" data type in Chez Scheme.

I was looking through the code for a small operating system, posted by
Chris Haynes recently.  I found the functions "box", "set-box!", and
"swap-box!" used as primitives.  Could someone familiar with Chez Scheme
explain what these do ?  Equivalent functions written in standard (R^3)
Scheme would be helpful.

Kevin Esler, Honeywell Bull Inc, Billerica, MA.