[OS X TeX] navigating through the source file

[Nicolae Garleanu]

Hi,
Is there a way to move the cursor one page up (or down) at a time on a small-format keyboard (such as on a MBA)? I tried to combine the arrow keys with any of the `special' keys, but I haven't found it. If there's none, one should be able to bind some key to the command, provided that one knows the command (I don't).
A possibly harder one would be: is there a key combination that recanters the source window (vertically) around the cursor (thus, the line with the cursor is now in the middle of the page)?
Thank you.
Nicolae
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