A portion of my webpage changes dynamically — how on Earth do I let screen readers know?

Question

Is it possible to dynamically update a portion of a webpage (for example: to display a list of errors from a form submission) and indicate to screen readers that they should skip to the updated portion?

Are full (non-Ajax) postbacks the only way to have accessible error messages?

Edit (please see comments)

To be clear, by "screen readers", I am referring to software that either speaks the text on the screen or converts that text to Braille.

Answer 1

Maybe this might help

Making Ajax Work with Screen Readers

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Also See
Implementing Screen Reader in Ajax