If we speak about writing drivers, we have to divide between kernel drivers and appserver drivers. Kernel drivers are used for hardware like soundcards, networkcards and also for file-system addons. Graphics drivers and the highlevel part of input drivers are handled by the appserver. While kernel drivers are written in C, appserver addons are written in C++. Common to both is that they are simple ELF modules, which are loaded if necessary. Unlike some UNIX systems, Pyro has a defined interface between the drivers and the kernel/appserver, which is not changed very often.

Please note that you have to be careful when writing drivers because a bug in a driver can cause the system to lock up and make it completely unusable. If you can, you should have a second Pyro installation, which you can use to remove invalid drivers.