The following is a list of form elements that may appear in a HTTP search request. These are usually used in conjunction with the <form> elements in your search page.
| IW_FIELD_OK | Optional name for the submit button. |
| IW_FIELD_TEXT | Perceptive Enterprise Search command query text. |
| IW_FIELD_NATURAL_LANGUAGE | Perceptive Enterprise Search natural language query text. |
| IW_FIELD_ENGLISH | Perceptive Enterprise Search natural language query text. |
| IW_FIELD_ADVANCE_AND | Used for the advanced search form; specifies the words that must be AND-ed together. |
| IW_FIELD_ADVANCE_OR | Used for the advanced search form; specifies the words that must be OR-ed together. |
| IW_FIELD_ADVANCE_NOT | Used for the advanced search form; specifies the words that must NOT appear. |
| IW_FIELD_ADVANCE_PHRASE | Used for the advanced search form; specifies the exact phrase that is to be found. |
| IW_FIELD_WEB_STYLE | Used to submit a "web style" query. |
| IW_BATCHSIZE | Indicates the number of items to show on each page. |
| IW_SORT | Indicates the sort order of the result list. |
| IW_INDEX | Specifies one or more indexes to search. |
| IW_DATABASE | (deprecated) Specifies one or more indexes to search. Use IW_INDEX. |
| IW_NOSYNONYM | (deprecated) Disable synonyms from being expanded at search time. Use IW_SYNONYMS. |
| IW_USE_THESAURUS | (deprecated) This field will allow the user to turn on "WordNet" thesaurus. Use IW_THESAURUS. |
| IW_AUTOCONFLATE | (deprecated) Enables word tense conflation. Use IW_CONFLATION. |
| IW_META_BOOST | Allows you to adjust the significance of meta data when ranking documents. |
| IW_FIELD_IN_[meta] | Allows for refined searching into custom meta data fields. |
| IW_FIELD_AFTER_[meta] | Allows for refined searching into custom meta data fields. |
| IW_SYNONYMS | Indicates if synonyms are on or off. |
| IW_THESAURUS | Indicates if the thesaurus is on or off. |
| IW_CONFLATION | Indicates the level of conflation to apply to the query. |
| IW_BESTBETS | Indicates if best bets should be searched, overriding the default value specified by the site administrator. |
| IW_BESTBETS_COUNT | Indicates the number of best bets to return, overriding the default value specified by the site administrator. |
| IW_BESTBETS_THRESHOLD | Indicates the best bets threshold, overriding the default value specified by the site administrator. |
| IW_SEARCH_SCOPE | Specifies to scope of the search: either "entire document", "body only" or "meta only". |
| IW_FILTER_PATH | Specifies a file path inclusion filter. |
| IW_FILTER_OMIT_PATH | Specifies a file path exclusion filter. |
| IW_FILTER_FNAME_LIKE | Specifies a file name pattern inclusion filter. |
| IW_FILTER_FNAME_UNLIKE | Specifies a file name pattern exclusion filter. |
| IW_FILTER_DATE_BEFORE | Specifies a date or relative offset indicating that documents must be dated before this value to appear in the result list. |
| IW_FILTER_DATE_AFTER | Specifies a date or relative offset indicating that documents must be dated after this value to appear in the result list. |
| IW_FILTER_FIRST_DATE_BEFORE | Specifies a date or relative offset indicating that the first intelligent date recognized in the document must be dated before this value. |
| IW_FILTER_FIRST_DATE_AFTER | Specifies a date or relative offset indicating that the first intelligent date recognized in the document must be dated after this value. |
| IW_FILTER_INDEXED_DATE_BEFORE | Specifies a date or relative offset indicating that the date the document that was indexed must be dated before this value. |
| IW_FILTER_INDEXED_DATE_AFTER | Specifies a date or relative offset indicating that the date the document that was indexed must be dated after this value. |
| IW_FILTER_CATEGORY_LIKE | Specifies that only documents that match the specified category are to be shown. |
| IW_FILTER_CATEGORY_UNLIKE | Specifies that documents that do not match the specified category are to be shown. |
| IW_REQUERY | This field can be used to allow a user to refine their query. |
| IW_USER | Specifies the user name on a Perceptive Enterprise Search login page. |
| IW_PASSWORD | Specifies the password on a Perceptive Enterprise Search login page. |
| IW_REMEMBER_ME | Specifies the "Remember me on this computer" setting on a Perceptive Enterprise Search login page. |
| IW_SUBSCRIBE_SOURCE | Used in the subscribed search page, indicates the source result list for the subscribed search. |
| IW_SUBSCRIBE_TITLE | Used in the subscribed search page, indicates the title for the new subscribed search. |
| IW_SUBSCRIBE_EMAIL | Used in the subscribed search page, indicates the email address where the results are to be sent. |
| IW_SUBSCRIBE_TOKEN | Used in the subscribed search page, indicates a server generated token. |
| IW_SUBSCRIBE_VALIDATION | Used in the subscribed search page, handles input validation. |
| IW_SUBSCRIBE_USERNAME | Used in the subscribed search page, indicates the user's username. |
| IW_SUBSCRIBE_PASSWORD | Used in the subscribed search page, indicates the user's password. |
| IW_SOUNDS_LIKE | Performs a sounds like on the query term. |
| IW_LANGUAGE_PACK | Indicates the language used for searching, this controls search options including stemming/conflation and synonyms. The value is specified as the ISO two digit language code. |