Are applications launched from RAM, or can they be run from flash?
Any application (could be apps running on top of a multi-sandbox firmware or standalone firmware) can run either in flash or RAM. The choice is implemented in the drivers and linker files during the platform and firmware development:
for multi-sandbox firmware: in our demo firmware (e.g. the one you find on the MicroEJ Studio page http://developer.microej.com/getting-started.html), the firmware is linked in flash, the apps binary are stored in a FAT file system (typically SD card) - not executable- and they run from RAM (typically from external SDRAM when available). It’s an implementation choice: of course apps can also be stored when downloaded in flash and run from flash.
for mono sandbox firmware (app and platform are linked into a single binary), the firmware are often linked and executed from flash. Implementation is decided during the platform development.
For more details on mono/multi sandbox firmware, see http://developer.microej.com/glossary.html.