Stocks Short Interest

How is short interest? Reuters reported that there were changes in short interest of certain STO
CKS. "This includes things like stock options and purchase and sale on the margin? While the population is purchased in which to slide down?
If you sell security short, has a short position up to buy shares to cover and close the position. Interest in "short" is the total number of shares of vacancies, as reported by brokers. It has nothing to do with the installation or range of purchase, even if it must be approved by your agent for a margin account to sell short by that broker.
The Meaning of Short Interest Ratios