Answer
OpenGIS Location Services or OpenLS is a protocol that provides access to the Core Services and Abstract Data Types or ADT that comprises an open location services platform defined by the Open GIS Consortium.
OpenLS allows seamless access to multiple content repositories and service frameworks that work across many different networks and devices. OpenLS ArcWeb Services support versions 1.0 and 1.1 of the OpenLS Specification.
See the link in the Related Information section below for more information on using OpenLS to access ArcWeb Services.