I was going through my helpful flags, when I came across this question I flagged: How to approach $\int\limits_0^\infty \frac{\tan^{-1}\alpha x\tan^{-1}\beta x}{x^2}\,\mathrm{d}x$?
Notice how the question isn't closed, even though my flag is a helpful flag. What does it mean exactly when a flag is helpful, and how exactly do helpful flags get questions closed?