TASK DEFINITION: You will be given a trivia clue, and the category it belongs to. You should answer with the best answer that belongs in the category and is described by the clue. For simplicity, answers should be in all lower cased letters.
PROBLEM: Category: DOUBLE TALK 
Clue: This word for an inadvisable act is a real double negative

SOLUTION: no-no

PROBLEM: Category: THE COMPUTER AGE 
Clue: Dan Bricklin developed VISICALC, the first of these programs, similar to an accounting ledger

SOLUTION: spreadsheet

PROBLEM: Category: TOOL TIME 
Clue: The working tools of a blacksmith include a bellows, a hammer & one of these sturdy, iron hammering blocks

SOLUTION:
an anvil