FYI: I am developing on a new iMac using Mac OS X 10.6.2, Java 1.5.x and the Eclipse 3.4 [Ganymede]. Previously developing on a Win XP system until I purchased a new iMac... I am developing a Java stand alone application and debugging it on a Win XP node and a Mac OS X node. Often I have JDialog windows that have one or more text fields and a JButton at the bottom that uses the setMnemonic method to enable alt/key keyboard combinations to be used by my end user. These Dialogs work fine on the XP node. On the Mac OS X node, sometimes, when I enter the Alt/key keyboard combination an 8 bit character is entered into the text field component that has the focus. For example, when entering a Alt/c combo to activate a Continue JButton, the errant character is the Latin small letter c with cedilla extended ascii character [231 base 10, E7 base 16]. Questions: I know that Mac OS X uses Unicode encoding somehow, thus the 8 bit character but why are these Latin characters being randomly inserted at the focus point of my text fields? Has anyone heard of such a problem on the Mac OS X platform? Can you recommend a link that details the differences between Java Application hosted in a Mac and a Win XP system?