A CSHS can be launched from a static link with optional predefined authentication as follows
https://{hostname:port}/teamworks/redirect-login.jsp?credentials=ZWhlbHA=:YWJjZDEyMzQ=&j_forward=executecf%3FmodelID=1.ec18923e-96e8-4c94-8b9a-d2d1eba0b20b%26snapshotID=2064.5f535ce0-4ac6-4e25-b08f-542f78433398
credentials=ZWhlbHA=:YWJjZDEyMzQ= is the base64 encoded userid:password a
modelID and snapshotid can be retrieved by running the service and "open in New Window in the top bar of process portal
e.g. /teamworks/executecf?modelID=1.82577808-bc62-4652-90ab-f5ab65acf512&snapshotID=2064.a01d03e9-b4c2-4420-947f-1d6653f4fc61