The automatic launching of an attachment can be accomplished by replacing the URL of the current window or frame,...
The pass-thru HTML method utilises the <meta http-equiv="refresh" content = "1; url"> statement to refresh the URL of the current window. The <meta http-equiv="refresh" content = "1; url"> statement will cause the current window's URL to be refreshed with the new URL after the specified number of seconds.
HTML standards require that this statement be placed in the "<head>" section of the HTML page. This can be accomplished by placing the pass-thru HTML in a field with the name "$$HTMLHead"
In Netscape, the attachment is always launched in a new session of the attachment's native application. In Explorer, Microsoft application files will activate a viewer inside the window (display the contents of the file using an Active X control) and non-Microsoft application files will be launched in a new session of the attachment's native application.
BONUS: Using Frames and Explorer, it is possible to easily view a word document inside a Web browser.