sslider (SHORT)
If this value is outside the scroll-bar range, the slider is moved to the nearest valid position within the range.
sfirst (SHORT)
This value must not be less than 0. If a value less than 0 is supplied, 0 is used as the value.
slast (SHORT)
The value must not be less than 0 or sfirst. If a value less than this is supplied, the higher of 0 or sfirst is used as the value.
rc (BOOL)
TRUE