2. Interfaz con el usuario

6. (años 70) CP/M (Programa de control para monitores)

7. (1973) Xerox Alto

8. (1981) Xerox 8010 Star

9. (1983) Apple Lisa Office System 1

10. (1984) VisiCorp Visi On

11. (1984) Mac OS System 1.0

12. (1985) Amiga Workbench 1.0

13. (1985) Windows 1.0x

14. (1985) GEM

15. (1986) IRIX 3

16. (1986) GEOS

17. (1987) Windows 2.0x

18. (1988) OS/2 1.x

19. (1989) NeXTSTEP / OPENSTEP 1.0

20. (1989) OS/2 1.20

21. (1990) Windows 3.0

22. (1991) Amiga Workbench 2.04

23. (1991) Mac OS System 7

24. (1992) Windows 3.1

25. (1992) OS/2 2.0

26. (1995) Windows 95

27. (1996) OS/2 Warp 4

28. (1997) Mac OS System 8

29. (1998) Windows 98

30. (1998) KDE 1.0

31. (1999) BeOS 4.5

32. (1999) GNOME 1.0

33. (2001) Mac OS X

34. (2001) Windows XP

35. (2002) KDE 3

36. (2006) Beryl

37. (2007) Windows Vista

38. (2007) Mac OS X Leopard

39. (2008) GNOME 2.24

40. (2008) KDE 4.x

41. (2010) Ubuntu