The following is provided by WiredRed/Nefsis -- the service provider for our online classrooms:

Running on a Macintosh:

While we don’t currently have a Mac‐native version of our software, you can still run on a Macintosh computer if you’re able to boot into the Windows operating system (e.g., Windows XP) on your machine. Every Macintosh with an Intel‐based CPU has the capability of running a copy of the Windows operating system either via an emulation software package or by using Apple’s own Boot Camp software.

Information about VMware’s Fusion virtualization software can be found here,
http://www.vmware.com/products/fusion/

Information about Parallels virtualization software can be found here,
http://www.parallels.com/en/desktop/

Information about Apple’s Boot Camp software can be found here,
http://www.apple.com/support/bootcamp/

Information about Sun Microsystem's Virtual Box, free, software, which allows you to run both the Mac and Windows operating sytems at the same time can be found here.
http://www.virtualbox.org/

We find that the smaller Mac Books cannot emulate Windows operating system.

Here is a link to a vendor with what appears to be a resonable price for the Windows XP operating system.
http://pcdeal4u.com/xp-h.html
Get the CD rather than the online download; it will take longer for delivery, but you will need to have the CD to load it onto your Mac.