Meaning: the name of the last observation-file to be produced.
Format: Unix path-name
Example: "/obsdata/whtd/20000827/r12345678.fit"
Set: at initialisation; during the ARCHIVE action.
Meaning: the name of the current data-directory.
Format: Unix path-name.
Example: "/obsdata/whtd/20000827"
Set: at initialisation; during the OBSDATA and RUN actions.