OK, we knew Forms would be totally out. Likewise classic Reports with their request forms and pereviews. All would be replaced by RTC windows, i.e. Pages and Request Pages and RDLC previews.
But what about the various dialogs like MESSAGE and CONFIRM? What would show when I would program a codeunit calling either of these functions (or the others like ERROR)?
So I created this simple test codeunit, calling MESSAGE, ERROR and finally displaying the dialog giving a summary of the test result:
Running the codeunit:
- Launches RTC

- Display the CONFIRM

(Click No to ...)
- Enforce the ERROR and get the test result

Indeed C/SIDE is totally headless. All run-time GUI is displayed through RTC.
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