The CMS Muonsystem exploits three different detection technologies in both
the central and forward regions, in order to provide a good muon
identification and efficient event selection via a multi-level trigger. In
summer 2006 the CMS solenoid has been switched on for the first time,
generating successfully the designed magnetic field of B=4T. During this
period also a slice of the CMS detector was operational (the "CMS Cosmic
Challenge") including a subset of detectors from all three muon subsystems
along with the muon hardware alignment. A dedicated CMS cosmic muon
trigger had to be set-up, which was based on the Level-1 trigger inputs
from the muon subsystems. The CMS subsystems were integrated in the
central DAQ, detector control and data quality monitoring. Cosmic data
were taken in different trigger configurations in order to study the
behaviour of muon detectors in the magnetic field, combined detector
operations and trigger synchronization. The recorded data are used to
study alignment with tracks, to verify and tune the reconstruction
software. The layout and status of the CMS muon system is presented and
results of the recent cosmic challenge data taking are discussed.