All supported Yohkoh Software uses Unix environmentals and VMS logicals for data and database files. The Yohkoh Software tree is also defined in terms of environmental variables. This allows relocation of Yohkoh Software and/or database files to different paths, disks, or machines without any changes required in the source code and may occur transparently to the Yohkoh Software user. It also minimizes restrictions on disk space allocation as different sites may organize the Yohkoh databases to suit the local resources.