This some of how to develop drupal module using hook api.

examples\action_example\action_example.info
........\..............\action_example.module
........\..............\action_example.test
........\.jax_example\ajax_example.css
........\............\ajax_example.info
........\............\ajax_example.install
........\............\ajax_example.js
........\............\ajax_example.module
........\............\ajax_example.test
........\............\ajax_example_advanced.inc
........\............\ajax_example_graceful_degradation.inc
........\............\ajax_example_misc.inc
........\............\ajax_example_node_form_alter.inc
........\batch_example\batch_example.info
........\.............\batch_example.install
........\.............\batch_example.module
........\.............\batch_example.test
........\.lock_example\block_example.info
........\.............\block_example.install
........\.............\block_example.module
........\.............\block_example.test
........\cache_example\cache_example.info
........\.............\cache_example.module
........\.............\cache_example.test
........\.ontextual_links_example\contextual-links-example-object.tpl.php
........\........................\contextual_links_example.info
........\........................\contextual_links_example.module
........\........................\contextual_links_example.test
........\.ron_example\cron_example.info
........\............\cron_example.module
........\............\cron_example.test
........\dbtng_example\dbtng_example.info
........\.............\dbtng_example.install
........\.............\dbtng_example.module
........\.............\dbtng_example.test
........\email_example\email_example.info
........\.............\email_example.module
........\.............\email_example.test
........\examples.index.php
........\examples.info
........\examples.module
........\field_example\field_example.css
........\.............\field_example.info
........\.............\field_example.install
........\.............\field_example.js
........\.............\field_example.module
........\.............\field_example.test
........\..le_example\file_example.info
........\............\file_example.module
........\............\file_example.test
........\............\file_example_session_streams.inc
........\...ter_example\filter_example.info
........\..............\filter_example.module
........\..............\filter_example.test
........\.orm_example\form_example.info
........\............\form_example.module
........\............\form_example.test
........\............\form_example_elements.inc
........\............\form_example_states.inc
........\............\form_example_tutorial.inc
........\............\form_example_wizard.inc
........\image_example\image_example.info
........\.............\image_example.install
........\.............\image_example.module
........\.............\image_example.pages.inc
........\.............\image_example.test
........\js_example\accordion.tpl.php
........\..........\css\jsweights.css
........\..........\js\ajaxy.js
........\..........\..\black.js
........\..........\..\blue.js
........\..........\..\brown.js
........\..........\..\green.js
........\..........\..\purple.js
........\..........\..\red.js
........\..........\js_example.info
........\..........\js_example.module
........\LICENSE.txt
........\menu_example\menu_example.info
........\............\menu_example.module
........\............\menu_example.test
........\nodeapi_example\nodeapi_example.info
........\...............\nodeapi_example.install
........\...............\nodeapi_example.module
........\...............\nodeapi_example.test
........\...._access_example\node_access_example.info
........\...................\node_access_example.install
........\...................\node_access_example.module
........\...................\node_access_example.test
........\.....example\node_example.info
........\............\node_example.install
........\............\node_example.module
........\............\node_example.test
........\pager_example\pager_example.info
........\.............\pager_example.module
.

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