Refine description of HAVE_FRONT_END use.

doc/html/programmer_guide.html

@@ -182,11 +182,16 @@ and the daemons initiated. About 110 test scripts exercise all SLURM commands
 and options including stress tests. Get these test from
 <a href="ftp://ftp.llnl.gov/pub/linux/slurm-qa">ftp://ftp.llnl.gov/pub/linux/slurm-qa</a></p>
 
-<h3>Cheats</h3>
+<h3>Tricks of the Trade</h3>
 <p>You can make a single node appear to SLURM as a Linux cluster by manually 
 defining <b>HAVE_FRONT_END</b> to have a non-zero value in the file <b>config.h</b>.
-All nodes should be defined in the <b>slurm.conf</b> file to have a <b>NodeAddr</b> 
-value of the node on which the <span class="commandline">slurmd</span> daemon executes.
+All (fake) nodes should be defined in the <b>slurm.conf</b> file.
+These nodes should be configured with a single <b>NodeAddr</b> value
+indicating the node on which single <span class="commandline">slurmd</span> daemon 
+executes.  Initiate one <span class="commandline">slurmd</span> and one 
+<span class="commandline">slurmctld</span> daemon. Do not initiate too many 
+simultaneous job steps to avoid overloading the 
+<span class="commandline">slurmd</span> daemon executing them all.</p>
 
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