Information on plugin usage for Opera.
Opera has got a Plug-in Application Programming Interface (API). You will finde some information and a link to the documentation here on the Opera website. The documentation itself is actually on the Netscape website.
Opera is currently implementing the Netscape4 plug-in API. The Netscape4 plug-in API is used in the Netscape4 Communicator/Navigator products. It is also partly supported by Mozilla and the Netscape6? browsers. Opera's implementation is based on a plug-in guide.