Two different technologies - Oracle Forms and Oracle OAF. Forms are still delivered via Java applet. Newer releases of EBS have been replacing forms with OAF counterparts however there are still thousands of forms which form the core of EBS and won't be going anywhere any time soon.
gotcha. Do all of the remaining forms run in web browser and not via applet on the client PC anymore?
No, they all still run in the java applet.