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Hands up if you want to volunteer for layoffs, IBM tells staff
(www.theregister.com)
This is a most excellent place for technology news and articles.
Generally it is proffered with a severance package that invalidates the unemployment. The package is likely better than what you'd get with unemployment and saves the company money by not increasing their unemployment insurance.
Depends on the jurisdiction. I got a decent severence and was still eligible for unemployment in WA state USA.