I have some clients that run in full screen mode (operator cannot get to the underlying desktop). If an error/warning box pops up (primarily on a non-touchscreen client), it is possible to minimize the pop-up. Since the error/warning boxes appear to be modal (as they should be) at least for the main window, if the error pop-up is minimized (no longer visible in full screen mode), the client is basically hung for the operator.
My suggestion is to have some global property setting for a client that disables the minimize button on all Error/Warning Pop-up boxes, if this is possible. However, if I’m missing something obvious, please let me know.
I’m using Debian Linux clients with Java 7.