| Input Parameters | Significance |
| DtvLong idn | ident number of the record |
| char *tab | name of the original table of the record |
| Output Parameters | Significance |
| char *usr | name of the user of the lock |
| Return Code | Significance |
| 0 | no error |
| 1 | no lock entry found |
| -1 | data base error reading locking entries |
In the calling function have to be allocated 21 bytes storage place.