For a quick access to the API reference of libraries, anjuta features an integrated API browser. If not already done it can be activated in the preferences (Edit ▸ Preferences) in General ▸ Plugins by choosing the DevHelp plugin.
The API reference has two windows, one for searching for a specific symbol and the browser for viewing the help documents.
In case you are unsure how a specific function used in existing code works, simply place the cursor on the function name and use Shift+F1 (or Help ▸ Context-Help) to jump to the documentation.
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