Use laptop between schools.
We have about 6 teachers this year from a neighboring school that will be teaching several lessons a week in this school (You can guess what's coming next) Their laptops are already provided by their existing school, but we need them to be able to access resources, e-mail and SIMS when they're in this school. I don't have enough spare laptops to act as loan units, so I'm looking for a workaround solutions. It needs to be easy and reliable obviously, as this is a permanent arrangement between the schools.
The best idea I've had so far is duel-booting the machine with 2 installations of windows on different partitions, allowing them to select which one they want at boot up. The problem we fall into with this is licensing, and possible issues with hard drive space so I'd prefer not to do this if possible, there must be an easier solution.
Any other ideas?