Hi

Those sys-files indeed are device drivers. You cannot execute them,
rather they are "executed" by the system (they are
loadable kernel-mode modules). If you want to know, which ones
are loaded, check your "device manager" (also activate "Show hidden
devices" in the view-menu) or check your registry
HKLM/SYSTEM/CurrentControlSet/Services.
For example, the file c:\windows\system32\drivers\IPSec.sys is
responsible for the IPSec functionality.


Nowadays, the WDM[1] is mostly used. As developer, you could use
the DDK[2]. I like the multipart-introduction at codeguru[3] or the
WDM-tutorial[4]

Cheers


[1] http://msdn.microsoft.com/library/de...6f32be.xml.asp
[2] http://www.microsoft.com/whdc/devtools/ddk/default.mspx
[3] http://www.thecodeproject.com/system/driverdev.asp
[4] http://www.thecodeproject.com/system...evelopment.asp