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diff --git a/ds9/doc/ref/vo.html b/ds9/doc/ref/vo.html new file mode 100644 index 0000000..3547d42 --- /dev/null +++ b/ds9/doc/ref/vo.html @@ -0,0 +1,69 @@ +<!DOCTYPE doctype PUBLIC "-//w3c//dtd html 4.0 transitional//en"> +<html> + <head> + <meta http-equiv="Content-Type" + content="text/html; charset=ISO-8859-1"> + <meta name="GENERATOR" + content="Mozilla/4.78 [en] (X11; U; Linux 2.4.7-10 i686) [Netscape]"> + <title>Virtual Observatory</title> + </head> + <body alink="#ff0000" bgcolor="#ffffff" vlink="#551a8b" text="#000000" + link="#0000ff"> + <h3><img alt="" src="../sun.gif" align="middle" width="100" height="98"> + Virtual Observatory Reference</h3> + <blockquote> + <p><b>Summary</b></p> + <p>Use the Web proxy connection if your firewall does not allow your + computer to connect directly to external computers. In this case, you + also must use DS9's internal browser.</p> + <p><b>Details</b></p> + <p>When you click on one of the Virtual Observatory servers in the VO + list, DS9 will attempt to connect to that server and (if the internal + Web display is enabled) display its Web page. The square box to the left + of the server name turns yellow while the connection is being + established and then green to signal success. </p> + <p>A direct connection is fast and flexible. Among other things, it + allows + you to perform analysis on your own local data (the VO server will + retrieve the image from DS9) and also allows you to use an + external browser to load images. </p> + <p>Some system managers configure their firewall explicitly to + prevent + computers in their care from making a direct connection to an external + host. Instead, they only allow external access through a Web proxy<br> + server (such as SOCKS). If you are using a computer behind a restricted + firewall of this sort, then DS9 will not be able to connect directly to + a VO server. The yellow box will not turn green and + eventually DS9 will display an error message. </p> + <p>In this case, you can choose to have DS9 communicate with the VO + servers through your Web proxy server. DS9 will use your proxy to send + its commands and retrieve its data and analysis results, rather than + doing this directly. Note that the following restrictions apply:<br> + </p> + <blockquote> <i>The transfer of data is slower.<br> + You must use the internal Web browser for loading images, etc.<br> + You cannot perform analysis on local data.<br> + There is a (large but finite) restriction on the number of + annuli, and number of polygon points you can specify in a region, as + well as the total number of regions allowed.</i><br> + </blockquote> + <p>If your computer and firewall have been configured to require use + of a + Web proxy server, you will have to tell DS9 about this server. + Click the <b>Configure Web Proxy</b> button and type the relevant + information into the boxes. (Your systems administrator will be able to + tell you the details.) At this point, + you should be able to connect to a VO server successfully. Please let + us know if you have problems! </p> + <blockquote> + <p> <i>A final note: you may, of course, choose to use the Web + proxy + even + if your computer and firewall are configured to allow direct + connections. In this case, there is no need to configure the proxy + server.<br> + </i></p> + </blockquote> + </blockquote> + </body> +</html> |