Hi There!

I have a client who has difficulty with his spelling (Learning disability). Some of the Apps he uses don't have  particularly good spell checkers built in, and I was hoping to help him by finding a popup spell checker that was product independent that if he hits a hot key, a little window with an edit box (which has focus) pops up so he can type the word he wants to spell and it will give him a list of suggestions. 

Anyone got any recommendations?