1. Create an out-of-process free threaded server that should implement your device control code in some C++ class - lets call it CMyDevice.
2. Use and STL container owned by the _Module to store your instances of devices, i.e. CMyDevice. A good idea is to identify which CMyDevice instance to use by the LPT port. So the use an STL map container.
3. Use the ATL wizard to create a free threaded component with a free threaded marshaller. Lets call it IMyDevice.
    - the IMyDevice interface that is exposed from this component is your device interface that should be used by your clients.
    - IMyDevice should have a local member pointer that points to the CMyDevice instance. Provide functions in your _Module to get/create an instance of CMyDevice and store a reference pointer to it in your IMyDevice CoClass.

4. Protect your functions manipulating the STL container in _Module with a critical section /the fastest/.
5. Protect your IMyDevice methods with critical section(s) as well.
6. To make sure when you run the server on a remote machine that all clients use the same instance of the server you should instantiate IMyDevice from your clients with the same identity. I guess you can use the DCOMCNFG to set-up that.
  ----- Original Message -----
  From: M.Frikel
  To: DCOMDISCUSS.MICROSOFT.COM
  Sent: Wednesday, April 18, 2001 4:01 PM
  Subject: DCOM vs. Devices

  Hi all,
  Thanks for your helpful contributions.
  Just to ask if someone has an idea (better a sample) how to control a device
  connected to
  a server machine from the client side? (using dcom technologies), e.g. the
  parallel port ...
  Thanks for your assistance and good continuation!

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