two:
Hiding the complexities of hardware from the user.
Managing between the hardware's resources which include the processors, memory, data storage and I/O devices.
Handling "interrupts" generated by the I/O controllers.
Sharing of I/O between many programs using the CPU.
Three:
Desktops
icons
menus
windows.
Seven:
The convention is that ellipses following a menu item usually means that the menu item will open a dialog box with further choices, rather than immediately carrying out an action.
Eight:
Organize Your Files
Nine:
Use the save as Command
name the File
Ten:
Open the file you want to delete
Select the file you want to delete
select Delete from the file menu
Confirm the deletion
Hope this helps