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title: SystemDoc
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System Documentation for Developers
===================================

Fundamentals
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 * [Qubes OS Architecture Overview](/doc/QubesArchitecture/)
 * [Qubes OS Architecture Spec v0.3 [PDF]](http://files.qubes-os.org/files/doc/arch-spec-0.3.pdf) (The original 2009 document that started this all...)
 * [Security-critical elements of Qubes OS](/doc/SecurityCriticalCode/)
 * Qubes RPC: [`qrexec` v2](/doc/Qrexec/) ([R2 implementation](/doc/Qrexec2Implementation/))
 * Qubes RPC: [`qrexec` v3](/doc/Qrexec3/) ([R3 implementation](/doc/Qrexec3Implementation/)) (Odyssey)
 * [Example for writing a `qrexec` service in Qubes OS (blog post)](http://theinvisiblethings.blogspot.com/2013/02/converting-untrusted-pdfs-into-trusted.html)
 * [Qubes GUI virtualization protocol](/doc/GUIdocs/)
 * [Networking in Qubes](/doc/QubesNet/)
 * [Implementation of template sharing and updating](/doc/TemplateImplementation/)

Services
--------
 * [Inter-domain file copying](/doc/Qfilecopy/) (deprecates [`qfileexchgd`](/doc/Qfileexchgd/))
 * [Dynamic memory management in Qubes](/doc/Qmemman/)
 * [Implementation of DisposableVMs](/doc/DVMimpl/)
 * [Article about disposable VMs](http://theinvisiblethings.blogspot.com/2010/06/disposable-vms.html)
 * [Dom0 secure update mechanism](/doc/Dom0SecureUpdates/)
 * VM secure update mechanism (forthcoming)

Debugging
---------
 * [Profiling python code](/doc/Profiling/)
 * [Test environment in separate machine for automatic tests](/doc/TestBench/)
 * [Automated tests](/doc/AutomatedTests/)
 * [VM-dom0 internal configuration interface](/doc/VMInterface/)
 * [Debugging Windows VMs](/doc/WindowsDebugging/)

Building
--------
 * [Building Qubes](/doc/QubesBuilder/) (["API" Details](/doc/QubesBuilderDetails/))
 * [Development Workflow](/doc/DevelopmentWorkflow/)
 * [KDE Dom0 packages for Qubes](/doc/KdeDom0/)
 * [How to build Qubes installation ISO](/doc/InstallationIsoBuilding/)
 * [Building Qubes OS 3.0 ISO](/doc/QubesR3Building/)
 * [Building USB passthrough support (experimental)](/doc/USBVM/)
 * [Building a TemplateVM based on a new OS (ArchLinux example)](/doc/BuildingNonFedoraTemplate/)
 * [Building the Archlinux Template](/doc/BuildingArchlinuxTemplate/)