| Constant | Value | Description |
| siFatal |
1 |
Fatal error has occurred; possibly leading to an unstable system state. Displayed as Message Box and in History window. |
| siError |
2 |
An error has occurred; possibly leading data loss. Displayed in History window and Status Bar. |
| siWarning |
4 |
An error has occurred but is recoverable. Displayed in History window and Status Bar. |
| siInfo |
8 |
Log an information message. Displayed in History window and Status Bar. |
| siVerbose |
16 |
Log a diagnostic information message. Displayed in History window. |
| siComment |
32 |
Log an information message without adding a prefix to describe its type |