Write two tasks that can be completed using the rules manager:  

When you create more than one conditional formatting rule for a range of cells, it helps to understand in what order these rules are evaluated, what happens when two or more rules conflict, how copying and pasting can affect rule evaluation, how to change the order in which rules are evaluated, and when to stop rule evaluation.

Answerdetailed systems design;

"computer screen desktop"? what? that phrase makes no sense, and it has nothing to do with modifying system components i assure you.