4  Reading and Writing Binary Data

5  Ports

5.1  Files and Ports

Help Desk: port, open-input-file, open-output-file

;; fprintf : oport string internal-S-expression ...  -->  void 
;; to print a series of Scheme values according to format to some output port

5.2  Strings and Ports

Help Desk: port string

5.3  Networks and Ports

Help Desk: TCP port

a simple web server

5.4  Creating Your Own Ports

Robby: example from DrScheme

(make-pipe)