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 ERROR expression%
 
 Usage Notes
   ■ If expression% is an error code already used by Visual Basic, the ERROR
     statement simulates the occurrence of that error.
 
   ■ To define your own error code, use a value that is greater than any
     used by the standard Basic error codes. Start by using error code
     32,767 and work down to avoid compromising compatibility with future
     Microsoft Basic error codes. In general, the error codes used by Visual
     Basic are between 1 and 100, although not all these are used.
 
   ■ If an ERROR statement is executed when no error-handling routine
     is enabled, Visual Basic generates an error message and stops program
     execution. If the ERROR statement specified an error code that Visual
     Basic does not use, the message "Unprintable error" is generated.