qrexec
qrexec is a framework within the Qubes OS operating system that enables secure inter-process communication (IPC) between different virtual machines (VMs), known as qubes. Its primary purpose is to allow a trusted qube to execute specific commands in a less trusted qube, retrieve their results, and handle exceptions. This mechanism is crucial for Qubes OS's security model, as it prevents direct access between qubes and channels operations through a controlled interface.
The qrexec framework operates by defining a set of services. A service is essentially a command that
This architecture allows Qubes OS to implement features like file copy-paste, opening documents from one qube