Sony PEG-S300 Read This First User Manual page 16

Dragging
Just as you use a mouse pointer to drag an item on your computer's screen,
you can drag an item on your Sony handheld screen by touching lightly on
the item with the stylus and moving the stylus along the screen surface.
Examples of dragging:
By dragging the scrollbar, you can view the portion of data that is not
displayed on the screen.
When selecting multiple characters, move the stylus along the desired
characters. The characters included in the area are selected together.
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Touch the desired item on the screen
with the stylus and move it along the
screen surface (drag).