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 Logs. Windows Vista includes two categories of event logs: Windows Logs and Applications and Services Logs logs. You can use either the Event Viewer or the wevtutil command-line tool to manage event logs. When you use wevtutil to manage event logs, messages that you receive from wevtutil might refer to event logs as channels.