I am referring to the trade box that appears following these steps:
From anywhere on the site, type something into the search box (like the word girl, for example)
Several results are returned in a list (12 for girl)
Place your cursor over the row of any security, and a trade button appears next to price
Click the trade button and a trade box appears.
I love this feature, I just wish all four options were there for quick clicking (so I don't have to type max to sell/cover)