Displays a dialog box and message and waits for you to choose a button
static int Alert( LPCTSTR message_text, unsigned short type_num = 2, LPCTSTR help_ref = 0 );
Message_text is the message displayed in the dialog box.
Type_num is a number from 1 to 3 specifying which type of dialog box to display.
Help_ref is a reference to a custom online Help topic, in the form "filename! topic_number".
Zero if the function has been called successfully; non-zero if the function could not be called. See Error codes for a list of return values.
See the Microsoft Excel on-line Help for full details about this function.