advise please

[gw@dsl.pitt.edu (gerhard werner)]

This is probably so trivial a question that I am embarrassed to ask 
it, but I am stuck: how can one refer to and access an instance of 
an object by creating its name inside a program ? I thought of 
using a format expression which composes the name, but this 
does not work. Any guidance available ?

Thank you. Gerhard Werner.