CMS (Computer Mail System) School-Net is an informal, grass-roots telecommunications network developed by the San Diego (California) School District to provide assistance in improving student language and communications skills. Each CMS electronic bulletin board represents a node in the network, which operates independently during the day as a fairly normal-looking electronic bulletin board program. However, two features make it unique among electronic bulletin boards: it allows students to send lengthy files to their correspondents, and, in the middle of the night, all of the CMS nodes in the network dial each other up and exchange e-mail, permitting a teacher in San Diego to send a batch of student writing to a teacher in any of 25 or 30 other places. The primary function of the network is to transmit student writing from one place to another, thereby providing real audiences and real purposes to motivate student writing. This paper includes suggestions for creating a CMS School-Net as well as technical details of the system and descriptions of several projects that have been completed on the San Diego CMS School-Net. An editor's update notes that the network is expanding, despite threatened budget cutbacks and budget restrictions that have forestalled program evaluations. (EW)