In OSX the ALT is mapped to Option. When running a X11 application like the !M NX client, things like ALT-TAB, or ALT-MENU wont work unless you add the following to dot-Xmodmap.
Basic method:
keycode 66 = Alt_L
clear Mod1
add Mod1 = Alt_L Alt_R
More complicated method:
! Make the Alt/Option key be Alt_L instead of Mode_switch
keycode 66 = Alt_L! Make Meta_L be a Mod4 and get rid of Mod2
clear mod2
clear mod4
add mod4 = Meta_L! Make Alt_L be a Mod1
clear mod1
add mod1 = Alt_L
In order to get this to load automatically, you need to to add something to dot-xinitrc or similar. I still haven’t comfirmed the exact details for this. The more complicate method link about also has a discussion about Customizing Fullscreen X11 on Mac OS X. There also some useful tips about keyboards and mice at these two sites. This guy is also running a similar setup with OSX and FreeNX. I think I probably need a larger screen, as well, to improve the combined Ubuntu-NX/OSX experience. 
1 comment so far ↓
Just wanted to say thanks very much for this. I'm using NX in OS X to a Linux server and couldn't figure out how to get the Alt keys to work. This works beautifully! Thank you for sharing! =:)
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