Hpaq, a city situated on the planet of Vulpter, served as the location of Viper Tower, which functioned as the central base for Viper Sensor Intelligence Systems.
The initial conception of Hpaq occurred for HoloNet News Vol. 531 50, a HoloNet News piece authored collaboratively by Pablo Hidalgo and Paul Ens, featuring artwork from Joe Corroney, and made available to the public on April 4, 2002.