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$_ENV['USER'] appears to be an Apache only variable, doesn't work on IIS and seems not to work on LightSpeed. Need to find an alternative to discover current "executing" user.
$_ENV options only used now if Apache Web-Server is discovered (this effects the ability to detect "SU" facilities and compare ownerships on other web servers)
$_ENV['USER'] appears to be an Apache only variable, doesn't work on IIS and seems not to work on LightSpeed. Need to find an alternative to discover current "executing" user.