Prerequisites
You can use external tools, that is, all standard Web development and design environments, to implement the page layout of your BSP application.
This requires, however, that the external tools support the WebDAV protocol and are able to function as a WebDAV client.
WebDAV is an extension of the HTTP protocol and generally provides an infrastructure for editing documents (such as HTML pages) across distributed Web development environments.
In this connection, the mySAP.com application server plays the role of a WebDAV server. It is equipped with an appropriate WebDAV service.
A WebDAV service is a special HTTP request handler that establishes a remote connection based on the WebDAV protocol. The WebDAV service is implemented through a global ABAP class.
Usage Scenarios
Implementing the Page Layout Using External Tools Mass Import of MIMEs Using WebDAV.