You do not need two copies of Filemaker because the correct phrase is:
if you wan to create a standalone DB for Mac you need a Mac
version of FMPand if you want to make a Windows DB you need a copy of FMP Advance for Windows.pc.
Assuming you buy a FMP CD, both the Windows and Mac installer is on the CD.
BUT, you will not see the other version when installing on a computer.
If you download only the application for one platform, you will need to download the other.
The database used for each runtime is the same file, just includes the platform specific files in the project folder.
Filemaker is currently running a two for one deal on FMP and FMP Advanced. until Oct 23rd 2013
Thanks both of you for your answers and the links. The bad news is I would have to find a Mac. The good news is I could then roll applications for all of my users that would save them a ton of money since they wouldn't have to buy a copy of FMP just to run it.
But please first research the limitations built in to Runtime Solutions. They cannot do everything that FileMaker Pro can do.
They can't generate charts of the data
They can't save as PDF
They can't serve as a client application that accesses a file hosted over a network.
They can't host a database over a network.
To name the most commonly encountered limitations...
Thanks PhilModJunk. Is there any place that has a full list of limitations? I couldn't find it searching.