If you are concerned with having many windows open when running several virtual machines on your Windows server or workstation, then have them run headless using VirtualBox commandline tools. Additionally, you can manage these VM's using RDP (Mircrosoft Terminal Server Connection - mstsc.exe) or SSH access (if enabled)
- Download the latest version and install of [Oracle VirtualBox] vbox
- Download the [VirtualBox Extension Pack] vbox and install for the same version
- Create your virtual machine using GUI or command line tools - refer to [VirtualBox Manual] manual
In a command promt window run the following:
VBoxManage modifyvm "work" --vrdeextpack default
VBoxManage modifyvm "work" --vrde on
VBoxManage modifyvm "work" --vrdeport 3391
VBoxManage modifyvm "work" --vrdeaddress 127.0.0.2
VBoxManage startvm "work" --type headless
mstsc /v:127.0.0.2:3391