ROSAT Centres in Germany, the UK and the USA (at MPE and GSFC for the XRT, at Leicester and AIT for the WFC) offer on-line services, through which users can access ROSAT related information like status reports, timelines, observation lists, software, etc. and retrieve data from the ROSAT Archives.
The following sections give short descriptions of the contents and the access to the services at the time of writing. Please consider that some access possibilities and services may have already changed from the examples given here. Every installation provides on-line help reflecting the actual status.