\c can be used
to put a cedilla on a letter `c' (either case), but on no other
letter.  So the following is legal
     Der K{\"o}nig sa\ss{} am wei{\ss}en Strand von Cura\c{c}ao und
     nippte an einer Pi\~{n}a Colada \ldots
and produces
Der König saß am weißen Strand von Curaçao und nippte an einer Piña Colada ...Not available in HTML are
Ji{\v r}\'{\i}, or Erd\H{o}s.
(You can tell Hyperlatex to simply typeset all these letters without
the accent by using the following in the preamble:
   \newcommand{\HlxIllegalAccent}[2]{#2}
Hyperlatex also understands the following symbols:
oe \oeå \aa¿ ?`OE \OEÅ \AA¡ !`æ \aeø \oß \ssÆ \AEØ \O§ \S© \copyright¶ \P£ \pounds
\quad and \qquad produce some empty space.