Format
attribute.
Attribute that identifies the format in which the information should be
returned if the slider arm position is requested. This value is ignored
for all other queries and is one of the following:
SMA_RANGEVALUE
The value returned in the low order
word represents the number of pixels between the home position and the current
arm position. The high order word represents the pixel count of the entire
range of the slider control.
SMA_INCREMENTVALUE
The value returned represents an increment position
using the primary scale.
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