Many in the RS World are turning to the XML Parser from MicroSoft
Using XMLHTTP you can acomplish remote scripting but there are pit falls.
The biggest pitfall is calling a page in the same directory will crash the server.
There is nothing to install or download, the parser is supported by most browsers
JSRS:
This method uses an Iframe to accomplish similar functionality.
Other than this problem with the history bug in Netscape - JSRS works fine. Any browser that supports Ifames will work fine with JSRS and since the Iframe is now a standard I believe this is the better choice of the two.
For Compatibility with all browsers JSRS offers RSLite - This one uses image/cookie method to accomplish Remote Scripting.