There's an app I just noticed on the app store called "RDM+ Remote Desktop for Mac OS and Windows" as well as several other similar apps (Jumimouse, ezDesktop, Remote Desktop - RDP, Desktop Connect, etc. Some of these just allow the user to look at the remote desktop, not actually interact with it).
Does anyone know -- could these be used to practice on Skritter? I'm hesitant to buy one of the apps, as Skriter would be the only reason I would want it. The higher rated versions (which also have more features) tend to be a bit expensive. But, it would be worth the price if I could use it to practice Skritter.