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<h4 class="subsection">9.4.1 Using a Networked Geomview Host</h4>
<p>The <code>Geomview</code> command looks at the <code>DISPLAY</code> or
<code>REMOTEHOST</code> environment variables to try to determine if you are
logged in from another computer. If either of these indicates that you
are, <code>Geomview</code> will attempt to run Geomview on that
computer. In order for this to work, your network must be configured
such that the Mathematica computer can successfully <code>rsh</code> to the
Geomview computer without giving a password.
<p>You can also explicitly set the <code>DisplayHost</code> option to the
<code>Geomview</code> command to a string which is the desired hostname, for
example:
<pre class="example"> In[1] := << OOGL.m
In[2] := Plot3D[Sin[x + Sin[y]], {x,-2,2},{y,-2,2}]
Out[2] := -Graphics3D-
In[3] := Geomview[%3, DisplayHost->"riemann"]
</pre>
<p class="noindent">This displays the graphics <code>%3</code> on the remote host named
<code>riemann</code>.
<p><code>Geomview</code> recognizes the string <code>"local"</code> as a value for
<code>$DisplayHost</code>; it forces the graphics to be displayed on the local
machine.
<p>In addition to knowing the name of the machine you want to run Geomview
on, <code>Geomview</code> needs to know the type of that machine (the setting
of the CPU variable that corresponds to the machine;
see <a href="Source-Code-Installation.html#Source-Code-Installation">Source Code Installation</a>).
By default, <code>Geomview</code> assumes that it is the same kind of
computer as the one you are running Mathematica on. The <code>MachType</code>
option lets you explicitly specify the type of the <code>DisplayHost</code>
computer; it should be one of the strings <code>"sgi"</code> or
<code>"next"</code> or <code>"x11"</code>.
<p>You can use <code>SetOptions</code> to change the default <code>DisplayHost</code>
and <code>MachType</code>. For example,
<pre class="example"> In[4] := SetOptions[Geomview, DisplayHost->"riemann", MachType->"sgi"]
</pre>
<p class="noindent">arranges for <code>Geomview</code> to run Geomview on an SGI workstation named
<code>riemann</code>.
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