I see some new features on pages on NAV 2013 R2, but I saw this only on small business role center. When I place cursor over field caption on some page, I can see mini manual for this field (what you can do with this field). But, when I place cursor on other pages, I see only this field caption.
This is extraordinarily features, if I could use this on all pages. This can be big help for my customizations.
You need to open Properties of field on page. Find "ToolTip" and fill this message you want to see when place cursor over field caption. In R2, you can find filled this only on SMB role center, but you can fill on all other pages by yourself. As you said, it is small, but excellent feature.
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