The optional data field, if used, contains binary data, which can be displayed in bytes or words. This information is generated by the application that was the source of the event record. Because the data appears in hexadecimal format, its meaning can be interpreted only by a support technician familiar with the source application.
When viewing an error log on a LAN Manager 2.x server, only the date, time, source, and event ID are shown. When viewing an audit log on a LAN Manager 2.x server, only the date, time, category, user, and computer are shown.