Partition sharing

[alex <radsky@ncia.net>]

I have four Linux systems (two Debians) installed with all sharing a 
single swap and a /home partition. (Don't ask why......it's just 
because they were available..... but everything seems to work fine.)

Question--what advantage or disadvantage would there be if multiple
Linux systems shared additional partitions such as /temp, /usr, 
/var,......?  Is this even practical?

alex