How to install and boot 145 operating systems in a PC

The 145 systems are:

3 Dos
5 Windows
137 Linux

I have also installed most of the PC-based BSD and Solaris together with a Darwin x86 too but these systems dislike to co-exist with a large number of other systems so I have to keep them off in another PC until I find a way to tackle the technical issues.

There are only 3 steps in this howto.