1. In a computer network having computer servers operating on different operating systems and a plurality of computer devices, each computer device being managed by a computer server at the operating system level, the computer network further having a plurality of information databases containing information associated with the users and with the computer devices of the computer network, a system for detecting the invalid access of a computer device to the computer network, comprising: means for generating on each computer server a set of identifying files for each computer device being managed by said computer server; means for gathering the sets of identifying files from the plurality of computer servers into a unique central violation database; means for creating links between each set of identifying files and the plurality of information databases; means for determining a level of network access violation for each computer device using the links previously created; and means for generating violation messages for each computer device based on the level of network access violation.