>I am using the Microsoft WebExplorer Activex to acces pages from my app, i am trying to post data into de destination but i do not find the way and i cann't find documentation about that activex, i am using the NavigateTo() method but i don't know how can i manage the parameters i should pass to that method. The information must be post like if i where using an HTML form with methos="POST".

This is mostly known as IE automation. Try something like this, assuming your object is known as loInternetExplorer:

loInternetExplorer.document.FormName.Field1.value=lcField1Value
loInternetExplorer.document.FormName.Field2.value=lcField2Value
...
loInternetExplorer.document.FormName.submit()