VitalSigns for NAC by Software Diversified Services replaces legacy mainframe network monitoring solutions. It provides tools for automating, monitoring, and troubleshooting SNA applications, z/OS Communications Server, and mainframe TCP/IP networks. VitalSigns for NAC allows running components off the mainframe to conserve CPU cycles, achieving up to 60% cost reduction. It generates significant MLC cost savings and conserves valuable z/OS resources. The browser-based mainframe automation manager is simple to use and does not require additional training for novice users. Existing z/OS REXX scripts can be easily ported to VitalSigns for NAC. It features a CPU-saving agent-server architecture and versatile security, making it an ideal replacement for legacy network automation products.