They were first developed to free application programmers from {HEAD ~ the chores} involved in displaying menus, {TAIL ~ windows}, dialog boxes, and other standard user interface elements for personal computers 
involved in displaying
They were first developed to free application programmers from { HEAD ~ the chores } involved in displaying menus , { TAIL ~ windows } , dialog boxes , and other standard user interface elements for personal computers
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH