As our hearing impaired readers are no doubt aware, AT&T has been offering its Instant Messaging Relay service since early this year, allowing folks to use AIM to communicate through an operator over the telephone in a manner similar to TDD devices. Now the company has announced an upgrade to the service that will allow real-time communication between callers. Instead of waiting for the relay operator to input long strings of text, users receive the messages word by word as they're typed. "To hearing users, this may sound like a trivial enhancement," said Claude Stout, Executive Director of TDI. "But for many callers with hearing or speech disabilities, this creates a wireless and on