Richard,
Thank you for your inquiry. What you wish to accomplish should be pretty straightforward since you already created users in the Checkbox database.
The ckbx_Credential table of the database contains a Guid field that can be passed to the survey page along with the survey guid. To create a link that automatically logs the user in, copy the survey link from the Activation page of the survey editor and append &userGuid=[USER_GUID] where [USER_GUID] is the value from the ckbx_Credential table that corresponds to the user you wish to login.
-Noah
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