Hello Bo,

  BS> But if we see in the OSI model, it's not really the application
    > layers job to make scure the data is valid. Which we actually do
    > anyhow, with fx. CRC check in Zmodem and brothers.

What is "fx"?  Which is older, the OSI model or XModem?

- Andy Ball

 * SLMR 2.1a *

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