1be61b371f81c9281c681fbf008f4676d487c7fd
kuhn
  Thu Feb 25 16:11:35 2021 -0800
added some clarifying text

diff --git src/hg/htdocs/FAQ/FAQlink.html src/hg/htdocs/FAQ/FAQlink.html
index 2ffa470..17de948 100755
--- src/hg/htdocs/FAQ/FAQlink.html
+++ src/hg/htdocs/FAQ/FAQlink.html
@@ -150,30 +150,32 @@
 display</li>
 </ul>
 <p>For example, the following URL hides all tracks (hideTracks=1), hides a specific composite
 track's default subtracks (refSeqComposite_hideKids=1), turns on one specific subtrack 
 (ncbiRefSeqCurated=full), and checks a box to display that subtrack 
 (ncbiRefSeqCurated_sel=1).
 
 <pre><a href="../cgi-bin/hgTracks?db=hg38&hideTracks=1&refSeqComposite_hideKids=1&ncbiRefSeqCurated=full&ncbiRefSeqCurated_sel=1" target="_blank">https://genome.ucsc.edu/cgi-bin/hgTracks?db=hg38&hideTracks=1&refSeqComposite_hideKids=1&ncbiRefSeqCurated=full&ncbiRefSeqCurated_sel=1</a></pre>
 
 
 <h2>Loading data with the URL</h2>
 <a name="custUrl"></a>
 <h3>Loading Custom Track data with the URL</h3>
 <h6>How do I create a link to my custom track data?</h6>
 <p>
+If you have a custom track on a web-accessible server, you can use the location of the file
+to load it directly as part of a URL.
 You can combine the URL visibility settings with the <code>hgct_customText=</code> parameter using
 a track line you would otherwise put in the <a href="../cgi-bin/hgCustom">custom track 
 input box</a>. The following example shows the <code>hgct_customText</code> parameter accepting
 a bigBed file URL as a custom track:
 </p>
 <pre><a href="../cgi-bin/hgTracks?db=hg38&position=chr21:34821279-34888690&hgct_customText=https://genome.ucsc.edu/goldenPath/help/examples/bigBedExample.bb" target="_blank">http://genome.ucsc.edu/cgi-bin/hgTracks?db=hg38&position=chr21:34821279-34888690&hgct_customText=https://genome.ucsc.edu/goldenPath/help/examples/bigBedExample.bb</a></pre>
 
 <p>
 If you want to add more information to the Custom Track, you can do so using the 
 <code>hgct_customText</code> parameter. Since this is a URL, you must use "%20" to encode
 for spaces and "%0A" for a new line character. For example, the following example shows Custom
 Track input pasted in the <a href="../cgi-bin/hgCustom">custom track input box</a> and the 
 equivalent input in the URL:
 
 <pre>browser position chr21:33038946-33039092
@@ -230,31 +232,33 @@
 <a name="gene"></a>
 You can also link directly to gene description pages from the URL. Instead of a position search,
 gene descriptions use the <code>hgg_gene=</code> URL parameter. The following URL connecting
 to 'hgGene' will open up the Genome Browser description page containing protein function,
 expression profile, and links to additional information for the gene TP53.
 </p>
 <p><code><a href="../cgi-bin/hgGene?db=hg19&hgg_gene=TP53" target="_blank">http://genome.ucsc.edu/cgi-bin/hgGene?db=hg19&hgg_gene=TP53</a> </code></p>
 
 
 
 <a name="hgsid"></a>
 <h2>The <em>hgsid</em> parameter</h2>
 <h6>What is the hgsid parameter and should I include it in Genome Browser links?</h6>
 <p>The hgsid is a temporary user ID that stores setting and custom track information in the URL.
 Including it in any shared URLs is a privacy concern, and it should be removed when
-constructing any links to the Genome Browser. Creating
+constructing any links to the Genome Browser. Most significantly, it will change after
+you share it. Anyone using it will see that last thing you did, not what you thought
+you were sharing.  Creating
 <a href="../goldenPath/help/hgSessionHelp.html#Create">Saved Sessions</a> is the recommended way to
 share Genome Browser information.
 </p>
 
 <a name="moreInfo"></a>
 <h2>Additional URL parameters</h2>
 <h6>Are there any more resources for URL and link parameters?</h6>
 <p>
 For more information, please see our <a href=../goldenPath/help/customTrack.html#optParams>section
 on URL parameters for custom tracks</a>. If you cannot find what 
 you are looking for, please contact our active mailing list by emailing 
 <a href="mailto:&#103;e&#110;o&#109;&#101;&#64;&#115;&#111;&#101;.&#117;&#99;&#115;c.
 e&#100;u">&#103;e&#110;o&#109;&#101;&#64;&#115;&#111;&#101;.&#117;&#99;&#115;c.e&#100;u</a>. All 
 messages sent to that address are publicly archived. If your question includes sensitive data, 
 you may send it instead to <a href="mailto:&#103;e&#110;&#111;&#109;&#101;&#45;&#119;w&#119;