Similarly, when the program running in foreground is performing {HEAD ~ process control functions} by manipulating data acquired or generated by the background process and returning control information to {TAIL ~ the background process}, the synchronization which this aspect of the invention makes possible insures that the control information being returned to the background process is always based on up to date acquired information 
Similarly , when the program running in foreground is performing { HEAD ~ process control functions } by manipulating data acquired or generated by the background process and returning control information to { TAIL ~ the background process } , the synchronization which this aspect of the invention makes possible insures that the control information being returned to the background process is always based on up to date acquired information
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