GtkAdjustment & scrolling

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Would appreciate any comments on the following:

My scrolled window is nicely scrolling but not with the step_ or page_ 
increments I want. Any values I set are promptly overwritten by 
defaults(?) such as step_increment equal one tenth of page_size.

When should I set increment values to be retained and used for scrolling.

Is it correct that
a) lower and upper are expressed in pixels of the large window part of 
which is showing in the viewport, and

b) value, step_increment, page_increment and page_size are, possibly 
fractional, pixel values in the trough of the scroll bar?

c) How do I get the program scroll to a particular coordinate X in the 
large window.

Any help or reference to documentation welcome. Thanks,
Enno
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