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-% $OpenXM$
+% $OpenXM: OpenXM/doc/issac2000/openxm-clients.tex,v 1.4 2000/01/13 09:21:34 ohara Exp $
+
+\section{OpenXM Clients}    
+
+\subsection{Risa/Asir}
+
+Risa/Asir provides a launcher to invoke an OpenXM server and to set up the
+communication between the server and itself. It also provides primitives
+for communication as built-in functions.
+
+\subsubsection{{\tt ox\_launch}}
+{\tt ox\_launch} is a general purpose launcher.  This application
+invokes a server and initiates the server-client communication
+according to the protocol stated in Section \ref{launcher}, then
+itself becomes a control server.
+Several facilities related to {{\tt ox\_launch}} are provided
+as built-in functions of Risa/Asir: a function to invoke a server
+automatically from a give host name and a server name, and a set 
+of functions to execute the port generation, {\tt bind}, {\tt listen},
+{\tt connect} and {\tt accept} operations on sockets individually.
+
+\subsubsection{Manipulating servers}
+
+Fundamental operations on OpenXM servers are sending and receiving
+of {\tt OX} data and sending of {\tt OX} commands. The following functions
+are provided to execute these primitive operations:
+{\tt ox\_push\_cmo()} for pushing data to a server, 
+{\tt ox\_push\_cmd()} for sending an {\tt SM} command to a server
+and {\tt ox\_get()} for receiving data from a stream.
+
+Some operations including the reset operation are realized by
+combining these primitives.  Among them, frequently used ones are
+provided as built-in functions. We show several ones.
+
+\begin{itemize}
+\item {\tt ox\_pop\_cmo()}
+
+It requests a server to send data on the stack to the stream, then
+it receives the data from the stream.
+
+\item {\tt ox\_cmo\_rpc()}
+
+After pushing the name of a function, arguments and the number of the
+arguments to the stack of a server, it request the server to execute
+the function. It does not wait the termination of the function call.
+
+\item {\tt ox\_reset()}
+
+After sending {\tt SM\_control\_reset\_connection} to a control server,
+it completes the operations stated in Section \ref{control}.
+\end{itemize}
+Furthermore {\tt ox\_select()} is provided to detect streams ready for
+reading. It is realized by the {\tt select()} system call and is used
+to avoid blocking on read operations.
+
+\subsection{Mathematica}
+
+We provide an OpenXM client {\tt math2ox} written as an external module
+for Mathematica.  Our client communicates to Mathematica by MathLink and
+to an OpenXM server by OpenXM protocols.  
+By using the module {\tt math2ox},
+we can call OpenXM servers from Mathematica;
+here is an example of a computation of the de Rham cohomology groups
+of ${\bf C}^2 \setminus V(x^3-y^2)$.
+{\footnotesize
+\begin{verbatim}
+In[1]:= Install["math2ox"]
+In[2]:= OxStart["../lib/sm1/bin/ox_sm1_forAsir"]
+In[3]:= OxExecute[" [(x^3-y^2) (x,y)] deRham "]
+In[4]:= OxPopString[]
+Out[4]=  [ 1 , 1 , 0 ] 
+\end{verbatim}
+}
+
+\subsubsection{Functions}
+
+The {\tt math2ox} has the following functions 
+which respectively correspond those in Risa/Asir.
+\begin{quote}
+{\tt OxStart[s\_String]} \\
+{\tt OxStartInsecure[s\_String]} \\
+{\tt OxExecuteString[s\_String]}  \\
+{\tt OxParse[s\_String]} \\
+{\tt OxGet[]} \\
+{\tt OxPopCMO[]} \\
+{\tt OxPopString[]} \\
+{\tt OxClose[]} \\
+{\tt OxReset[]}
+\end{quote}
+For example, the {\tt OxPopCMO[]} function above requests a server to
+send data on the stack to the stream, then it receives the data from the
+stream.
+
+By using the {\tt OxParse[]} function, we can send suitable OX messages,
+written by the OX expression, to a server.  OX expressions are
+Lisp-like expressions for OX messages and are defined
+in~\cite{noro-takayama}.  
+The {\tt OxGet[]} receives an OX data message
+and returns its translation to an local object.
+