| _Q_DB | Structure for independent database interface |
| _Q_DBRESULT | Structure for database result set |
| _Q_ENTRY | Structure for linked-list data structure |
| _Q_HASHARR | Structure for hash-table data structure based on array |
| _Q_HASHTBL | Structure for hash-table data structure |
| _Q_HTTPCLIENT | Structure for http client |
| _Q_LOG | Structure for file log |
| _Q_MUTEX_T | Variable type for lock management |
| _Q_NLOBJ_T | Variable type for named object with link |
| _Q_NOBJ_T | Variable type for named object |
| _Q_OBSTACK | Structure for obstack data structure |
| _Q_QUEUE | Structure for array-based circular-queue data structure |
