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It would be very useful to implement equivalents for the "up" and "down" commands in jdb, so that you could step up and down the call stack and see variables etc. on different points in the stack, without having to step to them (which could destroy information, and even change what you are trying to inspect!)
Oops! This feature is already present (the expand/collapse icons next to each line in the call stack). Sorry for time-wasting.