This page is about North Carolina's Medicaid Eligibility Information System (EIS), which is a mainframe computer program used in NC to determine eligibility for Medicaid. It is not clear whether there are any guidelines or rules available which express, in human-readable form, the requirements which the EIS software is supposed to follow; if there are any, they do not appear to be available online.
Access appears to be via text-based terminal, probably telnet or possibly ssh, through what is generally referred to as "the [North Carolina] state [computer] network". The user manual does not seem to give the address (IP address or domain name) of the server; it may be that it is only accessible via private network. (Some state universities appear to offer access via their campus networks.)
It's also not clear whether the EIS covers areas other than Medicaid; it appears to be a very large system.