The message-passing mechanism was redesigned to use shared memory pools with copy-on-write semantics. This reduced the overhead of cross-process communication by nearly in benchmark tests.
The .3 at the end corresponds to the "1.3" if we interpret 17763.3 as 1809 (1.0) → 17763.3 is the third build = "1.3". kernel os 1809 1.3
Refers to the Windows 10 "October 2018 Update" (codenamed Redstone 5). This specific build is often used for custom ISOs because it is considered very stable and compatible with older hardware. Revision (1.3): The message-passing mechanism was redesigned to use shared