For example, if the background process is acquiring data from instrumentation, and {TAIL ~ this data} is been communicated in real time to the foreground process via the device driver mechanism in {HEAD ~ accordance} with the invention, the interface routine in the background program can be programmed to wait until a requested item of data has been received and placed in temporary storage before yielding control back to the foreground process 
For example , if the background process is acquiring data from instrumentation , and { TAIL ~ this data } is been communicated in real time to the foreground process via the device driver mechanism in { HEAD ~ accordance } with the invention , the interface routine in the background program can be programmed to wait until a requested item of data has been received and placed in temporary storage before yielding control back to the foreground process
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