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STP DLL 2.1.1  released on 09.09.2008 :
  * Windriver 9.2.1 (or newer) is now standard driver for STP modules 
  * Module functionality not changed
  * changes required for Windriver 9.2.1,
  *    stpdll32.dll uses Windriver 9.2.1,  stp_wd5.dll uses old Windriver 5.2

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STP DLL 2.1  released on 10.08.2007 :
  * Module functionality not changed
  * changes required for Windriver 9.0,
  *    stp_wd9.dll uses Windriver 9.0,  stpdll32.dll uses old Windriver 5.2

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STP DLL v.2.0  released on 03.07.2002 :
  * support for STP-340 ( PCI bus version of STP-240)  module added