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Largest Buffered I/O Permitted? (Mailbox)

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The Question is:

Is there a limit on the maximum size of a single read or write to a mailbox
 when using sys$qio and sys$qiow? If so, how can I change this value?

The Answer is :

  The MAXBUF system parameter, most commonly.

answer written or last revised on ( 14-AUG-2001 )

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