As a consequence of the deficiency in CD40 ligand, the T-lymphocytes in patients with X-linked Hyper IgM (XHIGM) are unable to instruct B-lymphocytes to switch their production of immunoglobulins from IgM to IgG, IgA and IgE.
Windows event logs are also files, but they are commonly locked by Windows (Event Log Service) and it is impossible to open these files on live system. But if the computer is started from another disk or the system drive from the analyzed machine is connected to another computer, you can read event logs as files. The default location of event logs on Vista/2008 and better is C:\Windows\System32\winevt\Logs\.
Event Log types and event filtering in Windows. To see some typical events, click a log type. In Windows Vista and newer, expand Windows Logs section on the left first. 1  Application log includes events related to programs running on your computer-their important actions, warnings, errors and crashes.n Windows Vista, 7, 8 and 8.1, the log sizes are fine by default. If you start seeing Event log is full errors, verify that automatic overwriting of oldest events is enabled, and that log size is sufficient (at least 20 megabytes). To set maximum size for a log, right-click on Application and select Properties.