Using (mostly) undocumented windows functions for kernel <=> usermode communication. While ALPC can also be used for UM <=> UM, this example only demonstrates KM <=> UM. I have provided R/W functionality as a POC. Feel free to add onto the project as you please.

While other examples of ALPC exist, most are very outdated, and none are built with game hacking in mind.

Good read regarding ALPC:
https://csandker.io/2022/05/24/Offensive-Windows-IPC-3-ALPC.html

See some other sources here:
https://github.com/avalon1610/LPC
https://github.com/DownWithUp/ALPC-Example
https://github.com/csandker/InterProcessCommunication-Samples
https://github.com/Galenika/Diminish-self-leak/tree/main/Kernel