>>>>

>>            IF InternetWriteFile (hTarget, @lcBuffer, lnLength, @lnLength) = 1
>>                lnBytesWritten = lnBytesWritten + lnLength
>>                Wait Window NoWait "Processing . . ."
>>>>

...
>>the records are still truncated at 256
>>Record Length is truly 320
When I debug lnLength is showing 320 multiple
but MainFrame Programmers are getting 256.

>What command do you send to mainframe to set record size? Did you check for errors after that command execution?

No other commands (like Set Record Size) that I'm aware of ...

? lcbuffer && shows complete 12 records as expected