This article focuses on typographical spellchecking. Typographical spe
llchecking verifies the use of characters such as ? ! - ; : pound $ @
and other special purpose characters in respect to spaces or null elem
ents. The author claims that this kind of spellchecking has not been d
eveloped to any substantial degree, although it could be of considerab
le practical use as writer's aid. The article discusses the basic chal
lenges of typographical spellchecking and shows that some of the diffi
culties are greater than might be expected at first sight. Rules for d
escribing the behavior of typographical characters are proposed.