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\.
If you audit any of these kinds of events, WindowsÂ® records the events in the Security log, which you can find in Event Viewer. Account logon events. Audit this to see each instance of a user logging on to or logging off from another computer in which this computer is used to validate the account. Account logon events are generated in the domain controller's Security log when a domain user account is authenticated on a domain controller.