The ON command specifies an action for CDO to perform when it
    encounters an error condition during the execution of a command
    procedure.

    The following keywords allow you to specify error conditions of
    increasing severity:

    o  WARNING

    o  ERROR

    o  SEVERE_ERROR

    Error Handling if Action is CONTINUE describes error handling
    when you specify CONTINUE.

    Table 1-4 Error Handling if Action is CONTINUE

    Error Condition
    Specified        Action Taken on Error

    WARNING          Command procedure continues on warnings only; it
                     stops for errors or severe errors.

    ERROR            Command procedure continues on warnings and
                     errors; it stops for severe errors only.

    SEVERE_ERROR     Command procedure continues on warnings, errors,
                     and severe errors.

    Error Handling if Action is STOP describes error handling when
    you specify STOP.

    Table 1-5 Error Handling if Action is STOP

    Error Condition
    Specified        Action Taken on Error

    WARNING          Command procedure stops on warnings, errors, or
                     severe errors.

    ERROR            Command procedure stops on errors or severe
                     errors; it continues on warnings only.

    SEVERE_ERROR     Command procedure stops on severe errors; it
                     continues on warnings and errors.

    By default, errors cause CDO to stop execution if you do not
    specify an ON command within a command procedure. When CDO stops
    a command procedure, it returns you to the CDO prompt.

    If you nest command procedures and the ON command is executed,
    CDO returns you to the CDO prompt, instead of the previous
    command procedure.