[plt-scheme] Binding display function with outputting to textfile.

This is in regards to using the display function and outputting to a text
file.  What I want to do is only write to this file when the user enters the
function "hello".  I notice a problem from my code below is that when I
close the output port I am not able to write anything else to the file, but
I believe closing the port is when the writing actually happens.

(define o (open-output-file "helloworld.txt"))

(define hello
  (display "hello world" o) )

(close-output-port o)


Why does "hello world" get written to helloworld.txt when I run this, even
though it is within a function, and I never called that function in my
interaction window?

Any help would greatly be appreciated
Thanks
Jerron St. Armand
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