Each single-label computer (with the Unlabeled or RIPSO host type) is assigned a clearance in the Default Clearance field. The clearance sets the upper limit for write operations performed on the Trusted Solaris computer by someone on the unlabeled host. For example, on an unlabeled computer with a Default Label of CONFIDENTIAL and Default Clearance of SECRET, a user who is working on a file system mounted from a Trusted Solaris host can open an upgraded file with a label of SECRET and write into it (if the file's name is known to that user).