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You have several ways of creating a form with preloaded data:
1.1 Specify a default value for whatever fields you want to have a value for in the form.
1.2 Specify a "preload" page for the "free text" input, which will preload the free text field with the contents of that page.
1.3 Add 'preload=preload-page-name' to the 'query string=' value in the 'forminput' call; this will preload the entire form with the contents of that page.
2.1 Add a "preload=..." value to the query string for a 'FormStart' or 'FormEdit' URL.
2.2 Add "template-name[field-name]=field-value" to the 'query_string' value in the 'forminput' call, to set the value for a specific field.
2.3 To preload values for more than one field use "&": "template-name[field-name-1]=field-value-1&template-name[field-name-2]=field-value-2"
3 Add a value for a specific field to the URL query string for FormStart or FormEdit.
4 Create your own custom handling, using the 'sfEditFormPreloadText' hook. If another extension calls this hook, it can preload data however it wants. The function registered with this hook should have a header like "function-name(&$page_contents, $page_title, $form_title)".