...
- download the Microsoft Remote Desktop Client from the Apple App Store (apple ID required)
- start the microsoft remote desktop client
- click on the "+" icon in the menu bar and select "Add Workspace"
- enter the URL: "rdsnx.ethz.ch" (in case rdsnx.ethz.ch does not work, try to use: "https://rdsnx.ethz.ch/RDWeb/Feed/webfeed.aspx", under User Account select "Add User Account..." and click "Add"
- enter your eth username and e-mail password → hit "add"
- you can now find the resources under the "Workspaces" tab in the menu "RDSNX Resources"
...