When using JBuilder, you can set bookmarks in your open files to easily move back-and-forth between these files. For example, suppose you have five files open at one time, but for a little while you just want to move back and forth between File1.java and File2.java. Bookmarks let you do this. You set one bookmark in File1.java, and another bookmark in File2.java.
Because you set bookmarks at specific line numbers, you also go right back to the same line each time you move back and forth.
Okay, so how do I set a bookmark?