[Chicken-users] Set! question

[William Ramsay]

Hi,

I'm suddenly confused on how set! works.     Suppose I have two 
variables, A & B.    If A ="Hello"
and I call (set! B A), both A and B will equal "Hello".   If I call 
(set! B "Good-bye") I would assume
that B now equals "Good-bye" and that A still equals "Hello", but is 
this the case?

My real call was a bit more complex (i.e (set! B (vector-ref A 6))).    
In this case I assume the same
will be true.   If (vector-ref A 6) equals "Hello" as above, when I set 
B to "Good-bye" the vector
reference also changes.   It is after all, a reference - but if changing 
B changes A, how do I keep this
from happening?    I want to get the value from the vector, play with it 
a bit, but leave it's vector
value alone.  

Bill