Probably a MAC.  My MAC catches most, (but not all) of my typing/spelling errors as I go, and places a red dashed underscore beneath the word.  Then I "right click" on a track pad with only one button, and it gives me suggestions. 
Which word processing program do you use? I have tested several word processing programs for Windows and Linux. In my opinion Word Perfect is the best.
Jeanette Isabelle
 
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I'm not sure whose twisted idea it was to put hundreds of adolescents in underfunded schools run by people whose dreams were crushed years ago, but I admire the sadism. -- Wednesday Adams, Wednesday