Attached autorun script can be used to
1) Fix infinite DHCP loop
2) Upload ifconfig to predefined ftp server for easy pickup of this info. Just insert the CD in a server room and return to your working place waiting for ifconfig on another ftp server. This can be useful in MS environment where DHCP server is buggy enough to provide required info by itself.
3) Scan all partitions for autorun scripts and run them if present.