Hi,
To change between " , " and " . " decimal:
Switch the calculator off. Press and hold the decimal key while switching the calculator on.
To change the number of digits displayed, press "f" followed by "FIX" (above "7") followed by a number from 0 to 9 depending on the number of digits desired. (Similar for SCI and ENG modes).
The 11C manual is currently available on the HP website:
http://h10032.www1.hp.com/ctg/Manual/c00503576.pdf
Best regards.
-Bart
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calculator enthusiast