Collect String From HTTP Form POST

I have a basic form that POSTs data to a web server. The web server then replys with a string response. It goes something like this:

<FORM METHOD=POST ACTION="https://www.mywebserver.com/trans.dll">
<INPUT TYPE=HIDDEN NAME="x_Field1" VALUE="1">
<INPUT TYPE=HIDDEN NAME="x_Field2" VALUE="True">
<INPUT TYPE=HIDDEN NAME="x_Login" VALUE="MyUser">
<INPUT TYPE=SUBMIT VALUE="Click here To Submit">
</FORM>

The response is just a comma separated values string like:
1,0,2,3,0,Transaction Success,Etc

Once I hit the submit button the server returns a string response. I do not want the user to ever see the response, but need the response string to create my own page. How do I retreive that string and use it??