Here you will find answers to frequently asked questions about the ISA Dialog Manager.
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The display of umlauts is controlled by a number of components:
Which font is used (does it have the required umlauts?); which locale and code page is set for the application and which for the display; does the toolkit support these umlauts? etc.
As I said, there are a lot of screws that can be turned and that may be incorrectly adjusted.
The IDM itself uses UTF-8 and therefore supports Unicode.