VSI OpenVMS wiki is the world's biggest encyclopedia entirely dedicated to the OpenVMS operating system. The purpose of the project is to consolidate and organize information about this operating system and create an easily searcheable reference base to answer any questions about it. Ultimately, this encyclopedia should contain basic information on common features of OpenVMS and operations frequently performed by programmers and system managers using this system as well as links to the current documentation. The wiki model used to create this encyclopedia allows any registered user to write an article or suggest changes to an existing article, thus maximizing the number of contributions and maintaining the integrity and neutrality of the data.

OpenVMS is an operating system created in 1977 by the Digital Equipment Corporation and still widely used by large companies in the military, healthcare, banking, telecommunications and other industries. It is primarily known for its security and unrivaled clustering capabilities. It currently supports VAX, Alpha, and Itanium architectures and is working on a port to x86.