Returns an object reference to a Form by name
#include <IE.au3>
_IEFormGetObjByName ( ByRef $oObject, $sName [, $iIndex = 0] )
| $oObject | Object variable of an InternetExplorer.Application, Window or Frame object | 
| $sName | Specifies the name of the Form you wish to match | 
| $iIndex | [optional] If Form name occurs more than once, specifies instance by 0-based index 0 (Default) or positive integer returns an indexed instance -1 returns a collection of the specified Forms | 
| Success: | an object variable pointing to the Form object, @extended = form count. | 
| Failure: | sets the @error flag to non-zero. | 
| @error: | 3 ($_IEStatus_InvalidDataType) - Invalid Data Type 7 ($_IEStatus_NoMatch) - No Match | 
| @extended: | Contains invalid parameter number | 
If the desired form does not have a name or ID, _IEFormGetCollection() to get a reference by index.
_IEFormGetCollection, _IEFormReset, _IEFormSubmit
; Get a reference to a specific form by name.  In this case, submit a query
; to the Google search engine.  Note that the names of the form and form
; elements can be found by viewing the page HTML source
#include <IE.au3>
Local $oIE = _IECreate("http://www.google.com")
Local $oForm = _IEFormGetObjByName($oIE, "gbqf")
Local $oQuery = _IEFormElementGetObjByName($oForm, "q")
_IEFormElementSetValue($oQuery, "AutoIt IE.au3")
_IEFormSubmit($oForm)