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While using the MSC (Message Sequence Chart) package (msc.sty) I couldn’t compile my document by using PDF Texify in WinEdt. With the following sample code

\documentclass{article}
\usepackage{msc}
\begin{document}

\begin{msc}{Example}

\declinst{usr}{User}{}
\declinst{m1}{Machine 1}{control}
\declinst{m2}{Machine 2}{drill}
\declinst{m3}{Machine 3}{test}

\mess{startm1}{usr}{m1}
\nextlevel
\mess{startm2}{m1}{m2}
\nextlevel
\mess{continue}{m2}{m3}
\mess{log}{m1}{envleft}
\nextlevel
\mess{output}{m3}{usr}[2]
\nextlevel
\mess{free}{m1}{usr}
\nextlevel

\end{msc}

\end{document}

I get this error

! Undefined control sequence.
..
\declinst

I don’t know why exactly this happens, but the error suggests that it probably calls a command that doesn’t exist. Anyway, a quick fix (in WinEdt – MikTeX) is to do the following:

1. LaTeX compile it (Shift+Ctrl+L).
2. Then convert the .dvi file to .ps with DVIPS.
3. Finally use PS2PDF to get the PDF.

Any other sugestions are welcome.

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