Yes I'm sure many know
Apache writes logs and a pid file
see c:/xampp/apache/conf/*.conf andhttp://httpd.apache.org/docs/2.4/logs.htmlhttp://httpd.apache.org/docs/2.4/mod/mp ... ml#pidfile
php can write a log, see php.ini
mysql writes a log and pid file, see my.ini
filezilla writes a log, see it's settings dialog
mercurymail writes a log I'm sure, see settings inside it.
there may be more ... explore.