By signing the EuroHPC declaration, Austria has announced its intention of joining the EuroHPC Joint Undertaking (JU) proposed by the European Commission in January 2018, once it is formally adopted by the Council of the European Union. This is expected in the next few months.
Austria is not (yet?) member of the PRACE infrastructure for supercomputing. Most likely Austria will join PRACE too.
For more information on EuroHPC visit our site covering Europe's journey to exascale: