This document discusses SAP software and its key modules. SAP provides integrated end-to-end solutions for finance, sales, distribution, materials management, and human resources. The most important SAP modules are Financial Controlling, Sales & Distribution, Materials Management, and Human Resources. SAP R/3 was real-time with a three-tier architecture and compatible with multiple operating systems, allowing it to expand to new markets like retail. Application Link Enabling enables distributed applications across different countries, while remote function calls and electronic data interchange integrate data between SAP systems.