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Start the cmlog viewer by starting its Eclipse View. That is, Window -> Show View (you may need to select Other ... at this point) SEAL -> cmlog. Once started, use the File -> Get Messages dialog to connect to a cmlog server.
Known Issues
In Jira, Cmlog Viewer is a component in the SEAL Project:
https://jira.slac.stanford.edu/secure/IssueNavigator.jspa?reset=true&mode=hide&sorter/order=ASC&sorter/field=priority&pid=10447&component=10850