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On 14/01/2009, at 6:38 AM, Rory Hewitt wrote:

That's why I'm thinking of the data area method. It's simple and there is
little or no runtime overhead. The called program can't change it (because
it's still locked by the caller). But as you say, it's a hidden interface.
Mind you, that's what documentation is for, isn't it :-)

Data area access used to result in a synchronous I/O. I believe that is still the case. There may be little difference between accessing the data area and accessing the program information. I suggest you measure it.

Regards,
Simon Coulter.
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