LILO boot loader installed in the following three ways.
1. From the Master boot record of the hard drive.
2. from the superblock of root partition on the hard drive
3. From the CD-Rom or Floppy disk
LILO can be installed for the first time using shell script named QuickInst
If LlLo is not installed at the time of installing Linux without using quickinst.
The user can still install LILO in two steps
File /etc/lilo.conf is created and configured
/sbin/lilo is run to install LILO and LILO will be made active