- Letter:
AllA(25)B(22)C(25)D(14)E(9)F(19)G(14)H(17)I(12)J(5)K(9)L(13)M(25)N(17)P(17)Q(6)R(13)S(28)T(21)More
- Operating System:
AllWindows 95(3)Windows 98(3)Windows Me(3)Windows XP(7)Windows Vista(7)Windows 7(7)Windows 8(7)Windows 10(7)Windows 2000(7)Windows Server 2003(7)Windows Server 2008(7)Windows Server 2012(7)Windows Server 2016(7)Mac OS Classic(7)macOS(7)Linux(7)Android(4)iOS(7)