More recent and more detailed explanations of {HEAD ~ the PC/MS DOS device drivers} are contained in {TAIL ~ further references} cited later in this description 
More recent and more detailed explanations of { HEAD ~ the PC / MS DOS device drivers } are contained in { TAIL ~ further references } cited later in this description
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH