(ddd.info)Value Tips

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7.1 Showing Simple Values using Value Tips
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To display the value of a simple variable, move the mouse pointer on its
name.  After a second, a small window (called "value tip") pops up
showing the value of the variable pointed at.  The window disappears as
soon as you move the mouse pointer away from the variable.  The value is
also shown in the status line.

   You can disable value tips via `Edit => Preferences => General =>
Automatic display of variable values as popup tips'.

   You can disable displaying variable values in the status line via
`Edit => Preferences => General => Automatic display of variable values
in the status line'.

   These customizations are tied to the following resources:

 -- Resource: valueTips (class Tips)
     Whether value tips are enabled (`on', default) or not (`off').
     Value tips affect DDD performance and may be distracting for some
     experienced users.

 -- Resource: valueDocs (class Docs)
     Whether the display of variable values in the status line is
     enabled (`on', default) or not (`off').

   You can turn off value tips via `Edit => Preferences => General =>
Automatic Display of Variable Values'.