Write-EventLog lets you write custom entries to event logs, and New-EventLog can add new event logs and event sources. Which raises the question: how can you test in advance whether a given event log or event log source exists?
Here's how:
# check if event log name exists: [System.Diagnostics.EventLog]::Exists('Application') # check whether source exists: [System.Diagnostics.EventLog]::SourceExists('dcom')
Note that SourceExists() may raise an exception if you do not have Administrator privileges because then it cannot search all event logs.
