The kernel has an "official" version and a field test version. So do all the domain programs. Use the command "EXEC GDSKS ?" to find out more.
The Gnosis tools disk has an EXEC file called WRGNODOM which is used to write files on the domain field test disk. The command has two forms:
WRGNODOM fn (EXEC writes all the files listed in the file fn EXEC. The format is that produced by the CMS LISTFILE (EXEC command.