Opera : Java Glossary


Opera O logo  Opera

A small, fast, free browser that can run Java via the Java Plug-in using standard <APPLET tags. The latest version is Opera 39.0.2256.71 Last revised/verified: 2016-09-05.

It comes only in a 32-bit version. The 64-bit version has been discontinued. This is the browser I formerly most often myself and my web host (Inter-Corporate) also uses. The Opera icon to use for the 64-bit version. It is one of the few browsers that directly supports RSS feeds. Dragonfly is a tool similar to Firefox Firebug to help you figure out how CSS (Cascading Style Sheets) style sheet entries interact to decide the attributes of a given bit of text.

The secret to Opera’s speed is a technique called pipelining which allows it to download many small files almost as fast as if there were one big one.

Benefits Certificates Bugs DDE
Tips Gotchas Pet Tricks Links





Opera maintains its own list of SSL (Secure Sockets Layer) root certificates independent of Windows. You can manage it with:

  1. Click menu.
  2. Click settings.
  3. On the left, click Privacy and Security.
  4. Under HTTPS/SSL click manage certificates.



Build Numbers Opera does not change the version number with every release of the software, especially beta tests. You have to check the build numbers. To find out the latest build numbers visit snapshot. To display the build number add the following line to your opera6.ini file.
Title=(Opera %s) %t
You can also find the build number in the help ⇒ About Opera..

Pet Tricks

Opera has an optional turbo mode. You can try it out to see if it speeds things up. It will help most if your Internet connection is very slow. It works by caching the web pages you visit on the Opera server and relaying them to you compressed and encrypted. You can turn the feature on and off with the Opera turbo toggle in the main menu.

DDE (Dynamic Data Exchange)

If you want to set up some program, e.g. your newsreader to spawn Opera to display a URL using DDE, set it up like this:
use DDE : yes
application: F:\Program Files\Opera\opera.exe
DDE message: %1
application: Opera
topic: WWW_OpenURL
method: Request
If your app does not support DDE, then set up the spawn like this:
F:\Program Files\Opera\opera.exe %1

This page is posted
on the web at:


Optional Replicator mirror
of mindprod.com
on local hard disk J:

Please the feedback from other visitors, or your own feedback about the site.
Contact Roedy. Please feel free to link to this page without explicit permission.

Your face IP:[]
You are visitor number