Identifying Ultrix media

While cleaning, I dug up some ULTRIX CDs I didn't know I had. Curious as to find out exactly what I have and if it is complete... ULTRIX WS V2.0 (VAX) SUPPORTED/UNSUPPORTED February 1989 AG-ND76A-RE U-32 V3.1/UWS V2.2 (VAX/RISC) Supported/Unsupported Disc 1 of 1 January 1990 AG-PB5SA-RE ULTRIX-32 V3.1-UWS V2.1 (VX-RSC) UPD June 1989 AG-NJ50A-RE ULTRIX Online Documentation Library Diskc 1 of 1 December 1991 AG-PEZBH-RE ULTRIX and UWS V4.2 SUPP/UNSUPP (VAX) Includes Mandatory UPG Disc 1 of 1 June 1991 AG-ND76D-RE ULTRIX and UWS V4.2 SUPP/UNSUPP (RISC) Includes Mandatory UPG Disc 1 of 1 May 1991 AG-MM16F-RE Does this mean I have Ultrix 4.2 for VAX and RISC, Ultrix 3.1 for FAX and RISC, Ultrix 3.1 Update ? What is Ultrix WS 2.0 (windowing system?) ? Trying to figure out what I have here and how complete/ incomplete it is. Thanks, -- Curt