Makers of FirstDefense-Rescue with ISR technology. FirstDefense-Rescue can provide immediate recovery if you experience an operating system or application failure. Use FirstDefense-Rescue to create a rescue image of your healthy Microsoft Windows-based system. When you experience a Windows blue screen or software corruption, simply press F1 during the boot process to boot up on your rescue image without a lengthy restore process. Leapfrog Software's ISR technology focuses on providing bootable images of the operating system and applications for immediate recovery of the system without any rebuild time. High availability in today's network computing environment is an essential component of data protection.