color_requirements in drupal-6.x/modules/color/color.install

db_status_report in drupal-6.x/includes/database.pgsql.inc

Report database status.

db_status_report in drupal-6.x/includes/database.mysqli.inc

Report database status.

db_status_report in drupal-6.x/includes/database.mysql.inc

Report database status.

drupal_check_module in drupal-6.x/includes/install.inc

Check a module's requirements.

... See full list