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      Reserves exclusive access to the image stream of this device. When a device stream is locked, stream functions
      like unicap_queue_buffer and unicap_set_format may only be called with the handle that gathered the lock. 
       
	The lock works for all processes on the system but it is not guarranteed to work for processes running on 
	remote computers ( eg. a lock aquired for a FireWire camera on one system is not seen by an application 
	running on another computer on the same FireWire bus ). 
       
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| © 2006 Arne Caspari. All rights reserved. | ||||||