domain/url masking using mod_rewrite

[dannf]

Hi.  I want to use mod_rewrite/.htaccess to do domain/url masking.

 

I own 2 domain names both hosted on the same server, same hosting account same folders.

 

scenario:

 

the actual site is hosted at http://myfirstdomain.com

 

I want my other domain http://myseconddomain.com to point to myfirstdomain.com but retain myseconddomain.com in the address bar.  How can I do this using mod_rewrite?  Not a simple redirection but retaining the domain name of myseconddomain.com

 

any help would be greatly appreciated.  I'd like to do this without using frame forwarding, cnames, editing of httpd.conf and domain files or other php code.  I want to know if it is possible to do simply with .htaccess .

 

thanks