1. Fluctuations of aggregate economic activity. 2.Cycles Expansion/Boom and Contraction/Recession. Peak and Trough: They are the turning Points of the business cycle. 3. Comovements of many macro variables over the business cycle.
Section 5: Using external media: CDs, DVDs and removable USB storage devices. â¢ dvd-r:until about 2005 the most common and portable format; cannot be erased or reused. â¢ dvd-rw:are-writable version of-rformat, similar to cdrw format CD discs.
1 Remember this rule of thumb: some CD / DVD drives are simply Not Capable of reading / burning CD+G media.  This page lists *everything* that I know. do not write to me expecting I know some more secret tidbits, this is ALL I've got on the subject.