What is the En-Route Information Display system (ERIDS) used for?
Just visited a facility and learned what this is.

ERIDS provides digital access to static documents like standard procedures and things of that nature. ERIDS provides easier access to these documents than would otherwise be possible. ERIDS also provides a way (not the only way) to access NOTAMs or PIREPS or send PIREPS. I know controllers have other ways to access this information; I am not sure about other personnel. Having multiple ways to access or send this information is helpful to controllers as there may be multiple controllers in a sector and they may need to both access these services.

Essentially, ERIDS is just an informational system that is easy to access in an air route traffic control facility.