(ddd.info)Multiple Instances

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2.1.5 Multiple DDD Instances
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If you have multiple DDD instances running, they share common
preferences and history files.  This means that changes applied to one
instance may get lost when being overwritten by the other instance.
DDD has two means to protect you against unwanted losses.  The first
means is an automatic reloading of changed options, controlled by the
following resource (Note: Customizing):

 -- Resource: checkOptions (class CheckOptions)
     Every N seconds, where N is the value of this resource, DDD checks
     whether the options file has changed.  Default is `30', which
     means that every 30 seconds, DDD checks for the options file.
     Setting this resource to `0' disables checking for changed option
     files.

   Normally, automatic reloading of options should already suffice.  If
you need stronger protection, DDD also provides a warning against
multiple instances.  This warning is disabled by default, If you want to
be warned about multiple DDD invocations sharing the same preferences
and history files, enable `Edit => Preferences => Warn if Multiple DDD
Instances are Running'.

   This setting is tied to the following resource (Note: Customizing):

 -- Resource: warnIfLocked (class WarnIfLocked)
     Whether to warn if multiple DDD instances are running (`on') or
     not (`off', default).