Ordinary calculators have only one display.This Calculator has 28 displays(10 textfields to display results and 18 textfields to display user input numbers). All the 28 textfields act as memory cells.You can copy either results or your own inputs.You can View,Edit and Copy your previous inputs. Example: 2x3 can be performed as followed:1)Locate the textfields separated by X sign.Enter 2 in first textfield and 3 in second textfield(as you touch any textfield the iPhone keyboard pops up.you can use the iPhone keyboard to enter&edit numbers).After entering your input numbers(2&3) touch the = sign located near to the second textfield where you entered 3.The result appears near the = sign you touched.The result display can be copied. You can use this calculator in Portrait modes(home button top and home button bottom)only.Scroll up(▲) and scroll down(▼) buttons are provided to access textfields hidden by the popped out iPhone keyboard.Note:The textfields of this calculator accepts numbers only.Expressions will not be not processed.