you can install 4 OS in a single system
Single multitask
An example of Single task, single user Operating system is Palm OS for palm handheld computers.
single user os is that os which support only one user at a time and multi user os is that which support more than one user at the same time
Mac OS
yes
it is a multi user OS
No, you can create multiple accounts on most of the OS's
Mac-OS=Disk operating system==Linux OS==Windows OS==Unix OS=
No Single OS is "best suitable for servers". The choice of an OS depends greatly on the planned uses : each OS has it's various merits, and deficiencies.
OS :- Operating System
Mac-OS=Disk operating system==Linux OS==Windows OS==Unix OS=
Yes, you will just have to choose at startup which system you will use.duel booting is a service through which we can install 2 or more OS. but for this we can install one SOS(Simple Operating System) and one NOS (Network Operating System) that's it.