platform specific api usage

[Brons via Digitalmars-d-learn]

Hi,

Im trying to make a application to have global system hotkeys, 
and key emulation.
Ive found:
https://github.com/dlang/druntime/tree/master/src/core/sys/
https://github.com/madadam/X11.d/tree/master/X11
https://github.com/smjgordon/bindings

It looks like druntime is based off smjgordon. But i cant find 
any documentation on using any of them.

Id like it to work on windows and linux.
Any ideas on where to get started on this?