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Setting up 'Open + Save As' editing

When you choose to edit a file with 'Open + Save As' you first open the file you are asking to edit in whatever is a suitable editor on your computer.
Then, when you have made your changes you save the file to a so-called 'hot folder' on the Ensembling server. We spot the file arriving and automatically use it to supersede the version you originally opened. The file is then deleted from the hot folder.
So, superseding is simply a matter of saving the file, but you have to tell your computer where the folder is that you need to save in. You should only need to do this once. This is provided as an internet address (URL), username and password which you can get by clicking the "find out how here" link on the form.
The hot folder uses a method of saving files over the Internet called WebDAV (which Microsoft calls Web Folders). This is already built in to most computer operating systems and there are third-party applications available which also provide WebDAV services.

Microsoft Windows

In Microsoft Windows, there are several possible ways to connect to the hot folder:

Apple MacOS X

On MacOS X, on the Finder's Go menu, choose 'Connect to server'. When the dialogue pops up, enter the URL in the Server Address box and click Connect. It will then ask you for the username and password. Tick the box to remember the password or it will ask you every time you access it.
Then when you want to supersede just choose Save As in your editor and navigate to the network place (which will appear alongside your hard drives and be called supersede).

Linux

Among a variety of solutions, you could use davfs to make the hot folder available as if it were a local file system. You need to have root privileges to mount the file system, but any user should be able to use it once mounted to save changes to.

Security

The hot folder is controlled so that you cannot read other people's files and they are only present in the hot folder for a few seconds (though we cannot actually remove your file until you close it in programs which lock it, like Microsoft Word). Also, any unexpected files are immediately deleted, which is why it is important to use the name provided.
We use an unencrypted connection to transfer your files (the hot folder address starts 'http://' not 'https://') so in principle someone could snoop on the traffic from your computer while you are uploading.
The password is also transmitted without encryption. This is not a problem, however, since only you can read the files you save (or, strictly speaking, anyone sharing the same external IP address as you, for example other computers sharing the same wireless router to comment to the internet). Having a password merely deters casual intruders; it does not need to be secure.
The Windows Registry change allows your computer to access the hot folder with the unencrypted password. This would also apply to other WebDAV (Web Folders) you might access in the future, so you need to be aware of this change. A site which needs serious security, however, would not use this authentication method in the first place.

Internet Explorer doesn't offer me 'Run' when I try to run the batch file

Some system administrators have suppressed the Run button as a security measure. You can Save the file (anywhere) and it should then offer to let you Run it when it has downloaded (it will then usually ask again whether you really do want to run a downloaded program).
Internet Explorer may also be blocking downloads. While this is overkill for ordinary files, it is very sensible when the file being downloaded is a program as accidentally running an unknown program can harm your computer. It will pop up a yellow bar saying To help protect your security, Internet Explorer has blocked this site from downloading files to your computer. Click on the bar and choose Download File from the menu it pops up. The page will then refresh and you will have to repeat getting the file: choose
 
edit
then find out how here and then the Click here button again.