With VMware Workstation you may use several operative systems in the same PC and at the same time you will go from one to the other with just one click. So you do not need to re-start the system or change from one OP to the other and you may view them in complete active and ordinary screen.
When you install new operative systems, they keep themselves independently from the one you already have from the very beginning and they may be sent to other PCs that also have VMware Workstation installed. In this way you may do several tasks and try practically nay OS as support for the ones which are not used has been included.
Note: To authorize VMware Workstation you need to have an activation code from the official site.