What can be Built
You can design modal and non-modal windows, list windows, floating windows, and can even extend the built-in MoneyWorks windows.
Windows are (normally) based on some data source, which will typically be a MoneyWorks table, but might also be an external SQL database, another MoneyWorks file (using the REST APIs), or even a query on a website.
You can't however alter the basic layout and functioning of the built-in MoneyWorks windows (although you can extend them) as that might break things. But if you don’t like our window, you can with a bit of work (actually quite a lot of work), create your own replacement ones.