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How to get registry information using VIP?

In <VIP_root>\include\ApiCalls\Win\ directory we supply interface to some Windows API predicates handling registry information:

procedure LONG api_RegOpenKey( HKEY Key, STRING SubKey, HKEY Result ) 
procedure LONG api_RegCloseKey( HKEY Key ) 
procedure LONG api_RegEnumKey( HKEY Key, DWORD Index, STRING SubKey ) 
procedure LONG api_RegQueryValue( HKEY Key, STRING Subkey, STRING Value ) 
Example
predicates
determ STRING htm_GetBrowserFromRegestry()
clauses
htm_GetBrowserFromRegestry(BRW):- % obtain from registry (win 95/NT)
ApiRet1 = api_RegOpenKey(api_HKEY_CLASSES_ROOT,"",TKey ),
ApiRet1 = 0,
ApiRet2 = api_RegQueryValue(TKey,"htmlfile\\shell\\open\\command",BRW),
ApiRet2 = 0.