Magnanimous


  proceeding from or revealing generosity or nobility of mind, character, etc.: a magnanimous gesture of forgiveness.


A magnanimous person is someone whose generosity of spirit is large. A person willing to forgive an evil deed, demonstrating nobility and generosity of mind to his/her enemies.

Considerate


  Always thinking of what other people need or want and being careful
  not to upset them  He was always kind and considerate.


Word to describe "a person who is only wishful to help others and cares little about themself"?
I am aware that articles are the modifiers, which introduce a noun/noun_phrase in a sentence, and by the rules of English grammar we should use an article before referring to a noun in a sentence.

However, I see that the above rule is not strictly followed. I have seen sentences where though a noun/noun_phrase is used in a sentence but an introductory article is not used.

Eg : Login to desktop and start the paint application [ Desktop is a noun, hence I expect either "Login to a desktop and ...." or "Login to the desktop at the corner and ....."]

So please help me understand, when can an article be omitted ?
Thanks in advance.
