How do I do a Post to Classic ASP page in a new window?

Hi,
I am porting the launcher portion of an application from classic ASP to ASP.net Web Forms.  In the the classic ASP code we several occurances of standard forms with tags like :
<form action="abc.asp?tab=1" method="POST" name="frcont01" target="NewPlan"> This launches abc.asp in a new window and is fired from a submit button on the form.  How can I do something like this in ASP.net Web Forms? 
Jerry
PS.  A bigger question is wheter ASP.net Web forms is the appropriate technology for out launcher.   But, I will ask that in this separate question.  
http://forums.asp.net/p/1979020/5667822.aspx?p=True&t=635322313265433177&pagenum=1