3. New OS dependent features

See the Release Notes for non-OS dependent new features in XFree86 4.0.

3.1. New OS dependent features in 4.0

• Multi-thread safe libraries are built by default on OpenBSD 2.6 and later,
• Preliminary APM support.

3.2. New OS dependent features in 3.9.18

• Support for USB mices has been added on OpenBSD.
• Soft-booting secondary cards through the int10 BIOS interface is now possible using the x86emu real mode emulator.

3.3. New OS dependent features in 3.9.17

• Silken mouse is supported for serial mices, and, under post 2.6 OpenBSD-current for PS/2 mices.
• MTRR Write Combining is enabled under post 2.6 OpenBSD-current.