  The ACS Survey of Globular Clusters has used HST's Wide-Field Channel to
obtain uniform imaging of 65 of the nearest globular clusters to provide an
extensive homogeneous dataset for a broad range of scientific investigations.
The survey goals required not only a uniform observing strategy, but also a
uniform reduction strategy. To this end, we designed a sophisticated software
program to process the cluster data in an automated way. The program identifies
stars simultaneously in the multiple dithered exposures for each cluster and
measures them using the best available PSF models. We describe here in detail
the program's rationale, algorithms, and output. The routine was also designed
to perform artificial-star tests, and we run a standard set of ~10^5 tests for
each cluster in the survey. The catalog described here will be exploited in a
number of upcoming papers and will eventually be made available to the public
via the world-wide web.
