KPRB stands for what?

In an effort to educate myself, I've been doing some reading of the Oracle manuals & the Oracle Press book "Oracle 8i SQLJ Programming". Throughout the book & the Oracle doc. set the acronym "KPRB" is used, but I can not find a place where the actual basis is explicitly stated. The closest
"definition" from Oracle 8i SQLJ Developer's Guide and Reference states

"SQLJ code, as with any Java code, can run in the Oracle8i server in
stored procedures, stored functions, triggers, Enterprise JavaBeans, or CORBA objects. Database access is through a server-side implementation of the SQLJ runtime (with all SQLJ runtime packages automatically available) in combination with the Oracle JDBC server-side internal driver. (You will sometimes hear this referred to as the "KPRB driver".) "

It is more a matter of curiousity than anything else. I suspect the last two letters stand for Request Broker. So I'd like to know actually what the "KPRB" stands for.

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