The key used to find the client text orientation value, which is part of the dictionary returned by the method attributesForCharacterIndex:lineHeightRectangle:. The associated value is an NSNumber object that represents a BOOL value. A value of 1 means the client text uses a horizontal layout. A value of 0 means that the client text uses a vertical layout.
Available in Mac OS X v10.5 and later.
Declaration Syntax Version Information- Available in Monobjc Bridge: 10.6 (For Mac OS X 10.6 and later), 10.5 (For Mac OS X 10.5 and later)