Interactive and Urgent HPC: State of the Research. - Albert Reuther; William Arndt; Johannes Blaschke; Christian Boehme; Nick Brown; Antony Chazapis; Bjoern Enders; Jens Henrik Goebbert; Robert Henschel; Julian M. Kunkel; Maxime Martinasso; Michael F. Ringenburg; et al. (CoRR, 2026)