Terry,
good point - we should have mentioned it in the User Guide.
To answer your question. Objects are never removed from the Context unless the Context itself is removed - for example, when a process finishes its Context containing process parameters disappears. Or when rules attached to an object finish executing the Context is removed as well.
We have never come across yet any practical situation when it is necessary to explicitly remove an object from the Context. If you have such a situation please let us know - we may be able to suggest an alternative way of doing things, though.
