When FuncCount is zero or FuncNames is NULL, RexxSaveMacroSpace saves all functions in the macrospace.
Saved macrospace files can be used only with the same interpreter version that created the images. If RexxLoadMacroSpace is called to load a saved macrospace and the release level or service level is incorrect, RexxLoadMacroSpace fails. If RexxLoadMacroSpace fails, the REXX procedures must be reloaded individually from the original source programs.