For many of us, exporting locally and then transferring files manually to a server is the preferred method of publishing (avoiding all headaches associated with RW’s automatic publishing).
You will need a separate FTP application (like Transmit, Fetch, Yummy, etc.) to connect with your server and transfer files. Same app can be also used to delete and/or edit files on server.
You really shouldn’t “send” the files Published to a local folder to “preview”. Webpages are designed to be severed by a web server. Although many plain html pages can be viewed by a client locally things like PHP files and some links won’t work and will make the site appear broken. You’ll probably make a bad impression with the client.
It’s always best practice to have a user acceptance URL on a test domain or sub domain for the client to see and approve the site.