| GloballyUniqueIdentifier | Globally unique identifier type |
| su_home_s | Memory home structure |
| su_iovec_s | I/O vector for scatter-gather I/O |
| su_localinfo_s | Local address info structure |
| su_log_s | Log object |
| su_md5_t | MD5 context |
| su_msg_s | Message |
| su_port_s | Port is a per-thread reactor |
| su_port_vtable_t | Virtual function table for port |
| su_root_t | Root structure |
| su_sockaddr_u | Common socket address structure |
| su_time_s | Time in seconds and microsecondcs |
| ta_list | Object for accessing tagged argument lists |
| tag_class_s | Virtual function table for tags |
| tagi_t | Tag item |