>It complains that a TCPWINDOWSIZE of 131072 is invalid and is defaulting to
>131070 ????????

In the B/A client manual on the option:

    Note: Depending on the operating system communication settings, your
          system might not accept all values in the range of values.

That is, the value may not exceed the TCP/IP limits currently in effect
for your operating system.  The TSM client is programmed to check.
Code a value smaller in TSM, or boost your opsys limits, and the message
*should* not appear.

   Richard Sims, BU