A quick 'one-liner' back-and-forth will most likely show within a screen of some previous. I consider it more efficient than 10 MB/GB of previous history - and more effective too, with the time taken to scroll giving pause to think and consider ... :) I encountered this with my most effective intro to Electronics (pre-1960) being a "Tutor Text" tome that dived back and forth among non-sequential pages for answers and the following info and questions. Page 2 just said "I told you to go to page [x]". An occasional reference/link helps, but Farhan did ask.
73
