It’s a procedural strategy used to “hold in memory” an information. It was developed by Dr. Alan Beardall D.C. , founder of Clinical Kinesiology. 
It’s also called Advance and Lock in Clinical Kinesiology; Circuit Retaining Mode or simply Circuit in different branches of Energy Kinesiology. During a Therapy Localization/Location (TL), or a Circuit Localization (CL), or a Muscle Test, or the recall of an event, or during any action that we want to hold in memory and keep on line in the Biocomputer, the Kinesiologist will spread a part the legs, activating the Ruffini End Organs in the Coxo-Femural joint, producing an amplified electrical signal to the brain along with the specific information that has been activated. This signal acts as a carrier wave, that will keep the specific information in memory as long as the kinesiologist will keep the legs spread a part. 
Some branches of Kinesiology use more than one Pause Lock mechanism at the same time, to have the chance to hold more than one information. The most common secondary Pause Lock uses the Temporo-Mandibular Joint.
The Pause Lock mechanism is not recognized and used by orthodox Applied Kinesiology.