I have attended a Matrikon class and found that their Tunneler program bypasses the DCOM issues and it is very secure and reliable. It allows cross machine data access without the headaches of DCOM. Including the client machines in the same domain as our offplatform OPC server tends to make things easier. I don't think that I would use it for control unless it was a last resort, and then definitely use the watchdog. Ronald G. Schafer 10026 Old Ridge Rd. Ashland Va. 23009 804-227-4034 -- No attachments (even text) are allowed -- -- Type: text/x-vcard -- File: rschafer@xxxxxxxxxxxxxxxxxxxxxxxxxx -- Desc: rschafer@xxxxxxxxxxxxxxxxxxxxxxxxxx _______________________________________________________________________ This mailing list is neither sponsored nor endorsed by Invensys Process Systems (formerly The Foxboro Company). Use the info you obtain here at your own risks. Read http://www.thecassandraproject.org/disclaimer.html foxboro mailing list: //www.freelists.org/list/foxboro to subscribe: mailto:foxboro-request@xxxxxxxxxxxxx?subject=join to unsubscribe: mailto:foxboro-request@xxxxxxxxxxxxx?subject=leave