Most editors have a feature like when you press some keys by placing caret over a function, it pops the documentation of that function along with number and type of arguments that function takes.
I was wondering whether Vim offers such support. For example, while coding in C, I use a built in function
qsort(). Since I am not sure about type and number of arguments it takes, I would like to know it without escaping Vim. Is it possible?