You known, while coding, developer always don't want leave the favorite IDE. So,
why I need to launch a external tool for the API man page?
The idea is brought from other high level language, such java for Javadoc, and Eclipse and NetBeans all have implemented it.
See the Netbeans' screenshot:

• triggered by auto-complete
• the call tip/function signature showing up, along with
• the man page float window
  Thanks,
  Pprun