Retrieving data from aspx pages

Hi. I'm trying to write an application to retrieve financial data
(specially bonds data) from FINRA. The web page is served dynamically
from an asp.net application:

http://cxa.gtm.idmanagedsolutions.com/finra/BondCenter/AdvancedScreener.aspx

I'd like to know if it's possible to fill dynamically the web page
form from R and, after filling it (with the issuer name), retrieve the
web page, parse the data, and covert it to appropiate R objects.
For example, suppose I want to search data for AT&T bonds. I'd like to
know if it's possible, within R, to fill the page served from:

http://cxa.gtm.idmanagedsolutions.com/finra/BondCenter/AdvancedScreener.aspx

select the "corporate" option and fill with AT&T the field for "Issuer
name", ask the page to display the results, and retrieve the results
for each of the bonds issued by AT&T (for example:

http://cxa.gtm.idmanagedsolutions.com/finra/BondCenter/BondDetail.aspx?ID=MDAxOTU3Qko3)

and parsing the data from the web page.

Thanks in advance.