Clarifying 'Shifting' and OS Duration

Upon analyzing the available data, it becomes clear that quotations from the files 162_805.txt, 1078_5389.txt, and 9_40.txt provide neither any indication of the essence of "shifting" nor a description of how it differs from the OS, or how their durations are determined. This fact emphasizes the need for additional sources and clarifications that can help delve into the heart of the issue. In situations where key information remains outside the scope of the provided excerpts, it is important to incorporate additional materials to form a more complete and objective understanding of the topic. If you have the opportunity to share additional data or clarifications, it would greatly enrich our understanding and allow for a deeper analysis.
What is "shifting," how does it differ from the OS, and how is its duration determined?
Based on the provided data, none of the quoted excerpts contain any information regarding what "shifting" is, how it differs from the OS, or how their durations are determined. Neither the quote from file 162_805.txt, nor from file 1078_5389.txt, nor from file 9_40.txt touches on these topics.

If you have additional sources or clarifications for the required information, please provide them.