two linux versions on one hard drive?

[Jude DaShiell]

is something like this possible to do?  I figure to put redhat 8.0 on as 
one version with enough stuff to unpack books and another more secure 
installation like maybe a Fedora or a slackware installation perhaps 
version 10 when that comes out official.  Slackware rc 10 has already been 
released.  I tried bastille-linux with yarrow, and bastille-linux didn't 
know about yarrow or tettnang.  In fact it set the version of questions it 
would ask about all the way back to Redhat 8.0.  When something like that 
happens it gets me worried because security concerns that came into 
existence after Redhat 8.0 may or may not be addressed.  If those are new 
concerns and new problems, use of bastille-linux itself becomes a security 
exposure.