more info:
AutoCAD 2008:-

Annotation scaling Magic:
With AutoCAD 2008, Autodesk has solved this long-time frustration with a new concept called annotation scaling. Any text, dimension, leader, hatch pattern, block, or attribute can now be defined as annotative, and any of these objects already present in existing drawings can easily be made annotative when that drawing is opened in AutoCAD 2008 by assigning it an annotative property. Any object with the new annotative property can then have one or more scales assigned to it, so that the same object can appear in different viewports with varying scale factors.

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