In a system how many JVM's we can have?

Hi I got jdk 1.4 and jdk 1.5 installed in my system.So now the point is, consider i am running some services compatible to jdk 1.4 and some compatible with jdk 1.5.Now tell me how the JVM handles this scenario....?Thank you
[258 byte] By [hiremath47a] at [2007-11-27 7:32:30]
# 1
When you edit two files in notepad simultaneouslyhow does notepad handle that?
tschodta at 2007-7-12 19:12:48 > top of Java-index,Java HotSpot Virtual Machine,Specifications...