To satisfy with the convenient communication among the user within the LAN, the message passing, TALK, based on LAN was developed by the tools of Powerbuilder7.0.Secondly, the system database of the EPMI is designed.

• 为了方便局域网内各用户相互之间的通讯，作者用Powerbuilder7.；0开发基于局域网的消息传递即TALK对话功能。