Callable modules are those that GeoTAX uses to analyze your input addresses and match those addresses to the database. These modules are primarily designed so you can call them from your own COBOL applications.
For example, your organization might have a COBOL-written data entry system application. You want to accurately assign county name and FIPS county codes as they are entered into your system. GeoTAX provides a callable named GTMATCH to allow you to assign accurate county information as the addresses are passed into your order entry system.
For detailed information on GeoTAX callables, see Working With the Callable Functions.