From the looks of the linked question, it is the title
element of the information
section. So for the JNLP shown at Structure of the JNLP File it would be Dynamic Tree Demo
.
..if I'm making an applet, should it be "Applet-Name" instead of "Application-Name"?
I doubt it. Note that one Jar might contain an hybrid application/applet - one that can be deployed either way. They would have the same title, so it unnecessary to distinguish between the two (in the title
element or the manifest).