function RegQueryDWordValue(const RootKey: Integer; const SubKeyName, ValueName: String; var ResultDWord: Cardinal): Boolean;
Queries the specified REG_DWORD-type registry value, and returns the data in ResultDWord. Returns True if successful. When False is returned, ResultDWord is unmodified.
var
HistoryBufferSize: Cardinal;
begin
if RegQueryDWordValue(HKEY_CURRENT_USER, 'Console',
'HistoryBufferSize', HistoryBufferSize) then
begin
// Successfully read the value
MsgBox('Console history buffer size: ' + IntToStr(HistoryBufferSize),
mbInformation, MB_OK);
end;
end;