Keyboard of Computer?

Impossible, because of Mouse and keyboard are complementary, there are some things that should be made, or more easily done with the mouse, as well as the keyboard. all depends on the type of work performed.

you can use it by many ways

As above - yes but annoyingly difficult - because we are all mouse friendly, when it breaks we forget about tabbing and scrolling using manual keystrokes. Always keep a backup mouse, they are so cheap it is a worthwhile accessory.

Use Access Center to turn on mouse keys on your NUM Pad. After that you can use your NUM Pad to move Mouse Pointer or Cursor. It works just like mouse.

it's difficult but not impossible .....

Keyboards could be key factors for the desktop as its typing vectors to the CPU signals. For Lappy is best as its good inside inbuilt function!

Yes it is very much possible, with the help of your shortcut keys, ie, your FN, WIN KEY,ALT,CTR,SHIFT ETC.

No difference in the degree of difficulty. the keyboard layout is basically the same. if using the laptop at home and have set up space, having a separate wireless keyboard will help ergonomically

if i use a laptop then how it is easy. and if i use desktop then how it is difficult

If you use a laptop it is very easy, but i still prefer to use a mouse.

Ofcourse it is possible.. you can use the TAB, arrows, enter -buttons aswell

Yes. Time consuming as you use the short-cut keys combinations For example, CTRL + TAB to move thru several tabbed browser windows

Yes its is possible that you can use with keyboard,

Dificult but possibel