How can I play zoo tycoon in a separate window?

I want my zoo tycoon game to be running while I do other things on the computer, however the game is always in full screen. The only thing I can think of, is "ctrl, alt, del" then running "task manager" this seems to get me off the game while keeping it stored at the bottom, however I don't want to do this every time I flick between the windows. Anyone know how I can solve this?

What is a VPN?

VPN is (Virtual Private Network) were first used by companies to enable their employees to securely access internal systems such as email remotely (e.g. from home or while on business trips). Today they are increasingly being used for personal use by individuals to protect their privacy while online in public places (e.g. when using the wi-fi connection in a cafe) or in a country where the internet is censored / blocked (e.g. China, Saudi Arabia…).