working with pspell

Hi everybody, I just installed pspell and would like to get behind of the whole concept of spellchecking with php. As far as I understand, I have to check it word by word. Is there an algorithm which allowes to give a sentence to check and highlight all the words mispelled. On clickin the mispelled word to open a popup with suggestions and by clicking on the proper word to automaticly replace the wrong word. This sounds very complicated. Has anybody a good suggestion, or article to recommend on this topic? Thanx for your help, Andy