rc (ULONG) - returns

Return codes.
• Success

  ERROR_INVALID_LEVEL(124)

  ulVersion not 0.
  ERROR_INVALID_NAME(123)
  pszName is already used by a protocol converter or another control panel DLL.
  ERROR_INVALID_PARAMETER(87)
  ulFlags not 0 or invalid parameter given.
  ERROR_MOD_NOT_FOUND(126)
  Invalid path to DLL.
  ERROR_PROC_NOT_FOUND(127)
  pszDllPath does not export the two APIs for control panels (apiref refid=spqucp form=textonly. and SplDisplayControlPanel).

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