"Saw this while working on an AS400 with single level memory store. All of disk (permanant addresses) and all of memory (temporary addresses) would be available for a program to use. When the temporary addess space filled up, it could cause main storage to be overwritten. To combat this, a threshold was set to send a message when this threshold was approaching. After uploading a PTF service pack, I'd get that chilling message."
Toni Bowers is Managing Editor of TechRepublic and is the award-winning blogger of the Career Management blog. She has edited newsletters, books, and web sites pertaining to software, IT career, and IT management issues.