help for hirizontal communication

Hi friends,i m pooja well i want information regading horizontal communication.there is not much info is available.can any one give me any info regading it.mainly advantages n disadvantages.Plz its urgent do help me bye thnx

Hi in business,....
Horizontal communication between subsidiaries of the same multinational corporation (MNC) is a problem faced by staff as the demands for communicating across borders are pushed downwards in the organizational hierarchy. Although the choice of English as the common corporate language alleviates some of the horizontal communication problems, it does not solve them all--particularly not when many subsidiaries are located in non-English speaking countries. In that situation, horizontal communication between subsidiaries can be a significant casualty.
also refer book of rai&rai