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\.
Sending the Scheduled Tasks Log - Windows XP The Scheduled Tasks log (SchedLgU.txt), enables you to view more information about the status of a scheduled task. This log file for Scheduled Tasks is stored in the Windows folder, where it is used to record the activity of scheduled tasks. You can use the log file to determine why a task might have stopped, by viewing errors that may have encountered the task or to check on the status of a task.