The IOGEAR 4-port USB DVI Dual-Link Secure KVM Switch allows one USB console to control 4 computers and offers additional security features for government and military environment where security is imperative. The IOGEAR GCS1214TAA is NIAP-CERTIFIED - Validated to EAL2+ security requirements.Hardware security includes tamper-evident tape, chassis intrusion detection, and tamper-proof hardware, while software security includes restricted USB connectivity - non HIDs (Human Interface Devices) are ignored when switching - an isolated channel per port that makes it impossible for data to be transferred between secure and unsecure computers, and automatic clearing of the keyboard and mouse buffer.