The present invention is embodied in a system and method for providing positional authentication for client-server systems, such as extranets. A speculative thread is spawned at a specified point in the dynamic instruction stream and the instructions subsequent to the specified point are speculatively executed so that these instructions are fetched and issued out of sequential order. The first data field is used to specify a particular schema for presenting or managing a plurality of objects in a data polyarchy based on values of attributes in the objects. For example, if one of the input descriptions and output descriptions is scrolled, the other descriptions may be automatically scrolled. A DAC generates a bias voltage with a small quantization step, additionally providing a fine granularity of gain control.