What you are describing is this:

  1. If your tcpip stack supports window scaling;
  2. And if it is enabled for your machine and your userid/group;
  3. And if you set the receive buffer size immediately after connect
  4. And if the remote host tcpip stack also supports window scaling;
  5. And if it is enabled;
  6. And if all the firewalls, gateway devices and bridges between the ends support window scaling; have it enabled and are set to monitor the scaling factors;
  7. And if the bandwidth-delay product between them indicates a benefit from increasing the buffer size;
  8. And if the application retrieve rate is sufficiently high to merit it;
  9. And if the stack-wide maximum scaling factor permits it;

Then setting the receive buffer size may, heuristically allow an application to influence the setting of the window size/scale factor product.

That's an awful lot of ifs & buts, to be claiming "an application can set the window size".

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In reply to Re^6: changing tcp parameters when establishing connection by BrowserUk
in thread changing tcp parameters when establishing connection by iThunder

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