Hello Maria,
Standard accounts works in all platforms, MAC, WIN, Android, IOS.
Once you install and create a company in one computer, on second one, after installation, click on "Enter company details" and there's a button, connect to existing company. Click on it and search for the company you have created. Then click connect. And you will reach your company. Enter you log in details.
So yes, you can work on different platforms. If you need to work at the same time, you can order additional users.
Best regards,
Hansaworld support