hyphens

[me]

g'day again,

 in my 'book' class document i've foudn that Lyx
 and/or latex insists on putting hyphens in unintelligent
 places, such as "system-s".
 can anyone tell me how i can disable all hyphenation ?
 or is it possible to disable it on an individual paragraph 
 basis at least ?

please have a nice day.
susie.