Systems, methods, apparatus and software can utilize an extent guard to prevent modification of data in the storage resource while a third-party copy operation directed at the storage resource is occurring. The method includes imaging a sequential portion of the continuously moving web to provide digital information. Responsive to the registration termination request, re-registration notification is issued to the user and all identities of the said user from the first serving controller are dissociated. from the surface above a subterranean positioned marking tape. The at least one applicator element may also comprise a second portion comprising at least one recess. A control system can be utilized to regulate addition of the precursor compound, the intensity of the actinic radiation, and addition of the reducing agent to the water.