Among the benefits of McKesson's Horizon Practice Plus practice management system is the comprehensive master person index (MPI) that drives accurate patient information and business management. MPI has advanced search and retrieval technologies designed to prevent duplicate registrations and errors. The system enables scheduling of equipment, rooms, and personnel. McKesson's open architecture enables integration with Horizon Ambulatory Care and other hospital information systems. An appealing feature for office and IT managers is access to online worklists and collection tools that track payment activity from patient visit to collection of overdue accounts.