guessFileFormat         Automatically pick proper tape file format.
makeFileFormat          Setting tape file format/compression.
rtapeAdd                Add object to the tape.
rtapeAsList             Load the whole tape as a list.
rtapeFilter             Rerecord the tape dropping certain objects.
rtapeLapply             Iterate over tape, gathering results.
rtapeRerecord           Rerecord the tape.
rtape_apply             Iterate over tape, discarding results.
