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As an aid to understanding the ErrorClass, it is useful to organize the various ErrorClass methods into two large categories according to their expected use--the primary interface and the virtual methods. This organization reflects what we believe is typical use of the ErrorClass methods.

**Non-Virtual Methods**

The Non-Virtual Methods, which you are likely to call fairly routinely from your program, can be further divided into three categories:

**Housekeeping (one-time) Use:**

|  | Init | initialize the ErrorClass object |
|  | AddErrors | add or override recognized error definitions |
|  | SetFatality | change the severity level of a specific error |
|  | Kill | terminate the ErrorClass object |

**Mainstream Use:**

|  | Throw | process an error |
|  | ThrowFile | set substitution value of %File then process an error |
|  | ThrowMessage | set substitution value of %Message then process an error |
|  | Message | display an error message from the Errors list |

**Occasional Use:**

|  | SetField | set the substitution value of the %Field macro |
|  | SetFile | set the substitution value of the %File macro |
|  | SetErrors | save the current error state |
|  | SetId | make a selected error the current one |
|  | RemoveErrors | remove (and/or restore) error definitions |
|  | TakeError | process an error, assuming SetErrors has been called |

**Virtual Methods**

Typically, you will not call these methods directly--the Non-Virtual Methods call them. We anticipate you will want to override these methods, and because they are virtual, they are very easy to override. However they do provide reasonable default behavior in case you do not want to override them. These methods are listed functionally rather than alphabetically.

|  | TakeBenign | process benign errors |
|  | TakeNotify | process notify errors |
|  | TakeUser | process user errors |
|  | TakeFatal | process fatal errors |
|  | TakeProgram | process program errors |
|  | TakeOther | process any other errors |