4.3.6. Querier
| 4.3. Services |

### 4.3.6. Querier

The querier is an API tool for getting process records corresponding to different criteria. It can get records from journal, from history or both. This possibility is defined in the environment. Several parameters will allow us to obtain this information by various criteria: their state (running or after delivery) or ID. Depending on the circumstances this request will return a record, a set of records or an empty table.

4.3.5. Journal and History |  | 4.3.7. Command service