Thank you for the link, the answer to my question was as in the example you gave, but with a single argument. The solution to my problem given below works, but I can&#39;t find the answer to the following question. What is the difference between \dosingleempty and \dosingleargument ?<div>
<br></div><div>%%%%%%%%%%%%%%%%%%%%%%%</div><div><div>\unprotect</div><div><br></div><div>\definesystemvariable {dt}</div><div><br></div><div>\def\setuptitle</div><div>  {\dosingleempty\dosetuptitle}</div><div><br></div><div>
\def\dosetuptitle[#1]%</div><div>  {\def\dodosetuptitle##1%</div><div>     {\getparameters[\??dt][#1]}%</div><div>  \processcommalist[#1]\dodosetuptitle}</div><div><br></div><div>\def\placetitle</div><div>  {\startalignment[\v!middle]</div>
<div>   \blank[\v!force,2*\v!big]</div><div>   \@@dttitle</div><div>   \blank[3*\v!medium]</div><div>   \@@dtauthor</div><div>   \blank[2*\v!medium]</div><div>   \@@dtdate</div><div>   \blank[3*\v!medium]</div><div>   \stopalignment}</div>
<div><br></div><div>\setuptitle</div><div>  [\c!title=,</div><div>   \c!author=,</div><div>   \c!date=\currentdate]</div><div><br></div><div>\protect</div><div>%%%%%%%%%%%%%%%%%%%%</div><br><div class="gmail_quote">On Fri, Feb 5, 2010 at 11:29 AM, Wolfgang Schuster <span dir="ltr">&lt;<a href="mailto:schuster.wolfgang@googlemail.com">schuster.wolfgang@googlemail.com</a>&gt;</span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">Am 05.02.10 09:03, schrieb Marius:<div class="im"><br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Hello all,<br>
<br>
How do I define the \setuptitlepage and \placetitlepage commands in the<br>
environment file? These commands are used as shown in the example below.<br>
</blockquote>
<br></div>
Since you do not explain what do you expect from both commands it&#39;s not possible to give you an answer but you can find on the wiki [1] a example for a \setuptitle and \placetitle command which can be copied and used in your document.<br>

<br>
[1] <a href="http://wiki.contextgarden.net/Document_Titles#In_ConTeXt:_A_more_advanced_solution" target="_blank">http://wiki.contextgarden.net/Document_Titles#In_ConTeXt:_A_more_advanced_solution</a><br><font color="#888888">
<br>
Wolfgang</font></blockquote></div></div>