I have the whole GYST program loaded into Dropbox so that I can open it on any of my PC computers by opening it in Dropbox. That way I don't have to have the program on different computers because it's in Dropbox. I can use it at home or work wherever I need it. It's true it is only on PC but most businesses are PC as compared to MAC. You would have to get a Windows emulator for your MAC to run it.
I'm unsure if GYST is working on this but I'm pretty sure that soon there will be cloud based programs coming out in the near future. Then both PD or MAc would be able to use them.
It's a Data Base program. The information on art includes pretty much everything about each piece. Medium, size, item number, etc, etc. Available on consignment, sold, to whom. Info on your collectors, addresses and a host of other handy things to help.