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Steve has always been used to a settled home life . In our case the IR camera has been use to record the images and , up to a certain extent , the camera was acting as a wavefront sensor . Non-blocking synchronization has significant advantages over blocking synchronization : however , it has not been used to a significant degree in practice . Temporal logics have been used to this end for several years . Emergency disclosure has been used to investigate death threats in our schools , to recover victims in kidnaping cases , and to protect targeted government facilities against cyber-attack . The WFPC2 on board HST has been used to investigate the low-mass end of the main sequence in six globular clusters , near their half-mass radius , through deep imaging in the F606W and F814W bands .