(ddd.info)Looking up Definitions

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4.3.1 Looking up Definitions
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If you wish to lookup a specific function or variable definition whose
name is visible in the source text, click with _mouse button 1_ on the
function or variable name.  The name is copied to the argument field.
Change the name if desired and click on the `Lookup' button to find its
definition.

   As a faster alternative, you can simply press _mouse button 3_ on the
function name and select the `Lookup' item from the source popup menu.

   As an even faster alternative, you can also double-click on a
function call (an identifier followed by a `(' character) to lookup the
function definition.

   If a source file is not found, Note: Source Path, for specifying
source directories.