Please read the Companion guide. For additional details, and as suggested on the proposed chapter, you can get additional details on the SAS 9.4 Logging: Configuration and Programming Reference, Second Edition, more exactly here: http://support.sas.com/documentation/cdl/en/logug/67485/HTML/default/viewer.htm#p16tinhrondc9xn1xdjclrzjnxj1.htm
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