| 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. |