From the MaximDL help page:
(see the part in green)
"http://www.cyanogen.com/help/maximdl/AO_7_Locate_Tab.htm"
Quote:
Locate Mode
In order to find a suitable guide star to track on, first select the Locate mode. Choose an Exposure duration (in seconds), and click the Start button. If necessary, a dark frame will be taken and subtracted from the light frame. Once the image is taken, MaxIm DL will automatically select the best guide star candidate in the image, and report its information in the Guide Star group box. The Guide Star X and Y fields display the guide star position, in pixels, within the CCD chip, and its maximum pixel brightness is shown in the Brightness field below the coordinates. A small cross is drawn on the image to indicate the star's position. If you wish, you may click on any other star in the image to override the automatic star selection and select a new guide star to track.
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Does this work with the SXAO to let you choose your guidestar?
There are also plugins available for advanced guiding, I haven't tried them though:
http://winfij.homeip.net/maximdl.html