How do you change the Background image or picture on Windows desktop?

Which argument is not a valid filter? does not equal this quarter filter by cell color all of these are valid filter arguments.

Write a fragment of code that reads in strings from standard input, until end-of-file and prints to standard output the largest value. you may assume there is at least one value. (cascading/streaming logic, basic string processing)

How can you make your column headings stand out?