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Snap indicators are shown whenever a snap occurs. That is whenever a point of interest on the object
you are dragging comes in range of a point of interest in the document (which could be on another object
or be part of the page). Web Designer Premium snaps to the point of interest and the mouse pointer
changes to show a magnet symbol so you know a snap has happened. Also further indications are shown
dynamically on screen to help you see what snap has occurred.

A red dot indicates that a specific point has snapped

A blue line indicates a snap to some feature of another object (e.g. to the edge of a rectangle).

An orange line indicates a snap to a page feature (corners, edges, center)
The snap indicator lines pulse to show that they are temporary "live" indicators and to help them be seen
over different background colors.
The snapping distance is controlled by the Mouse tab of the Options dialog box ("Utilities" > "
Options" or right click a page and choose Page Options
).
You can specify two snap distances in the "Magetic snap radii" section, which control how close things
need to be before they will snap together. The size of a circle around points (point) and the distance
either side of lines (lines). It's usually best to make the point value larger than the line value, so that it's
easier to snap to the end points of lines.
Customizing Web Designer Premium
has full details of the Options dialog.
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