Well..... JDK is the Java Development Kit, with all the packages and classes to develop Java Programs. And JSDK is the Java Servlet Development Kit, especially to develop Java Servlets. By the way, do you have any insight into servlets?
If not, try looking at the Servlet section in the Java Forum of this site.
I don't think JDSK ( referring to either the Java Software Dev Kit, or the Java Servlet Dev Kit ) is a contemporary term any more.
There is j2ee ( enterprise including web services and web applications ), j2se ( standard or desktop app ), j2me ( micro or embedded ), and then other packages like jwsdk (IIRC) which is related to j2ee.
I'm still navigating the fla ( four letter acronym ) soup myself. To give you an idea though, I'm using tomcat in conjunction with j2se to develop JSP and Servlets. No explicit j2ee package exists for Mac, but to the best of my knowledge, an explicit j2ee package is unnecessary for developing with Tomcat.
-------<br /> Aodhan H - Ad Astra Per Aspera<br /> -------