EIS is an acronym for enterprise information system. 
An enterprise information system is the set of applications that 
comprise an enterprise's system for handling company-wide 
information. These applications provide an information infrastructure 
for an enterprise. An enterprise information system offers a 
well-defined set of services to its clients. These services are 
exposed to clients as local or remote interfaces. 
Examples of enterprise information systems include: 
enterprise resource planning systems, 
mainframe transaction processing systems, 
and legacy database systems. 
J2EETM Connector Architecture.