| CREATE | To set up an initial set of index files, or to clear out an existing index file, call IDBFunction with "CREATE" as its parameter. |
| UPDATE | To update an index to match changes in documents, call IDBFunction with "UPDATE" as its parameter. |
| OPTIMIZE | To optimize space and disk utilization, call IDBFunction with OPTIMIZE as its parameter. |
| REINDEX | When you need to re-initialize an index from scratch, call IDBFunction with "REINDEX" as its parameter. |
| PREVIEW | When you wish to scan an index directory for changed files, call IDBFunction with "PREVIEW" as its parameter. |
| STATISTICS | When you wish to gather and report statistics for an index, call IDBFunction with "STATISTICS" as its parameter. |
| FREQ | When you wish to list word frequency for an index, call IDBFunction with "FREQ" as its parameter. |
| LIST | If you wish to list all the documents in an index, call IDBFunction with "LIST" as its parameter |
| COMMON | If you wish to list the common words in an index, call IDBFunction with "COMMON" as its parameter. |
| VERSION | To get the complete ISYS version number, call IDBFunction with "VERSION" as its parameter. |
| USERS | To get the number of active and licensed users, call IDBFunction with "USERS" as its parameter. |
| ADD | To add documents to the index, call IDBFunction with "ADD" as its parameter. |