>Jos,
>
>Thanks for the courtesy of the comprehensive reply. Appreciated.
>
>Re the screenshot: we had a PHP version that allowed multiple windows all communicating with each other, but they all lived inside a parent browser window that had to be resized across all monitor space to use it all. Customers then complained that they want to be able to position non-app panels in amongst the app panels but they're hidden as soon as the browser gets focus. Resizing the parent browser window = no good because (of course) they want another vendor's ebook center screen. We actually found a way to do it outside a container browser in IE, but then MS closed that ability because it can represent a hack vendor. Hence the new-found fondness for Windows desktop apps where this is an ordinary requirement.
>
>Since then, I'm regularly advised that there's other ways for multiple browser windows to communicate without potential hack exposure in Edge or Chrome or whatever. Could be, but also a hacker could find a way to exploit it so it gets closed again as soon as we finish developing. ;-) Which risk by itself is a good reason for the safety of a desktop app using a development tool that won't be subject to waves of exciting rewrites. Perfect? No. But perfect is the enemy of good.
>
>Over the years comparing options it's also very clear that everybody has their own set of cues and drivers- otherwise everybody would have made their way to New Zealand by now and would be about to vote for Prime Minister Donald Trump because they're the greatest. ;-)
>
>(Excuse the provocative joke- but you get my point!)

LOL, yes. Just to clarify though - the screenshot shows 4 windows (but can be any number) inside a browser tab. Users can add, remove, resize windows to suit and switch tabs containing other unrelated website URLs etc. Changing the browser size has no effect on the contained windows of the website. The website is truly a 100% web-based solution, not a local desktop based solution. Nothing is running locally on the users machine; the whole thing is running off our server and just displaying content inside mutiple, interactive, user-definable windows which can contain charts or tables or whatever content the user chooses and all running inside a browser tab. All the windows are seperate objects being updated independently from each other but just displaying inside the same tab. There are no security issues other than on the server which naturally needs to be secured as per any website. It was just a proof-of-concept test we made as much as a learning experience as anything else.