A signaling arrangement and method for use in a wireless local area network managed by a system manager include a reader for electro-optically reading bar code symbols. The system manager verifies that a symbol has been successfully read and sends an acknowledgment signal by wireless, radio frequency...http://www.google.de/patents/US6764012?utm_source=gb-gplus-sharePatent US6764012 - Signaling arrangement for and method of signaling in a wireless local area network
