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<snip> > Secondary files are optional. In general it works like this, it reads all > records from the primary file, and then reads all records from Each > secondary file in the order they are listed. </snip> I think I understand. When you say it reads all recs from primary, and then from secondary, I assume you mean that all files are read from on each loop through. A free format equivalent (minus record blocking) would look like this: Dow Not %EOF(primary) Read primary; Read secondary; // Calc specs EndDo; Right? This might be interesting to try, although having seven pairs of files to compare/synchronize, I would have to write seven programs. But if it is faster, I might try it. One last question. There is a possibility that a record might be missing from either file, causing the synchronization of the input streams to be out of whack. If this is the case, Can I issue a READ op in the calc specs to either file to re-synch the files? -- "Enter any 11-digit prime number to continue..."
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