?platform()      -- WINDOWS=2, LINUX=3
?machine_bits() -- 32 or 64
?machine_word() -- 4 or 8
?include_paths() -- eg {"C:\\Program Files (x86)\\Phix\\builtins\\",
                 --     "C:\\Program Files (x86)\\Phix\\builtins\\VM\\",
                 --     "C:\\Program Files (x86)\\Phix\\"}
                 --  (plus other application-specific directories)
?get_interpreter() -- eg "C:\Program Files (x86)\Phix\p.exe"
                   -- or perhaps "/home/pete/phix/p" on Linux