NA> One is Turbopower's B-Tree ISAM library for the nodelist compiler, the   
   NA> other is TPCRT to replace the standard CRT library.   
      
   TurboPower open sourced almost everything they had.   
      
   https://sourceforge.net/p/tpbtreefiler/code/HEAD/tree/trunk/   
      
   OPRO was open sourced too but looks like the archive didn't make it to   
   sourceforge when TurboPower released everything.  It's been integrated into   
   vpacal and also here https://github.com/OS2World/DEV-PASCAL-UTIL   
   OBJPRFVP/blob/master/opcrt.pas   
      
   Rob   
      
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