Windows – the best way to hide a command prompt window

This is what I use. It starts the VMs on boot and saves their state on shutdown/reboot

#!/bin/bash
### BEGIN INIT INFO
# Provides:       vmboot
# Required-Start: vboxdrv
# Required-Stop:
# Default-Start:  2 3 4 5
# Default-Stop:   0 1 6
# Short-Description: Stop/Start VMs on System shutdown
### END INIT INFO

VBOXUSER=vboxuser
SU="sudo -H -u $VBOXUSER"
VBOXMANAGE=/usr/bin/VBoxManage
VBOXHEADLESS=/usr/bin/VBoxHeadless
RUNNINGVMS=$($SU $VBOXMANAGE --nologo list runningvms | sed -e 's/^".*".*{\(.*\)}/\1/')
ALLVMS=$($SU $VBOXMANAGE --nologo list vms | sed -e 's/^".*".*{\(.*\)}/\1/')

case $1 in
stop)
if [[ -n $RUNNINGVMS ]]; then
echo "Saving the state of all running VMs..."
for v in $RUNNINGVMS; do
    $SU $VBOXMANAGE --nologo controlvm $v savestate
done
fi
;;
start)
for v in $ALLVMS; do
if [[ -n $($SU $VBOXMANAGE --nologo showvminfo $v | grep saved) ]]; then
    echo "Restoring VMs..." && $SU $VBOXHEADLESS -s $v & > /dev/null
fi
done
;;
*)
echo "Usage: /etc/init.d/vmboot start | stop"; exit 1
;;
esac
exit 0

Just save it in /etc/init.d. I named mine vbox. Run update-rc.d <script name> defaults and you should be good to go.

You might try to press & hold Shift + Ctrl, then right-click your virtual machine on your taskbar. Select Minimize All, and if you want to restore select Restore All.

You have to use your taskbar for this. So maybe in your case when all VM's are fullscreen you only need to minimize one so that you can use your taskbar :)

Edit: I noticed that when you press shift + ctrl, windows changes your keyboard layout. Check this out if that's also the case for you. Then you may want to change those shortcuts :)