High Sierra

relatively free changes. APSF. With an EFI protocol added to support booting from a PFS volumes. Metal two, improved graphics, rendering API. EVC/HEIF codes. Apple saw metal as the feature of graphics on their platforms and deprecated open GL and open CL, which they had been Abbott supporters. Security wise – Colonel extension handling was full hardened with Kext loading restricted throug system preferences An important enhancement, unannounced and undocumented, the introduction of remote SPC. This important extension to Apple’s IPC allowed X.PC messages to be carried over IPv6 – which is the protocol over which newer MacBooks and IMAX communicate with the embedded bridge OS