Deepesh asked: >2) Will run on any Mac that has Appearance Manager 1.0 installed and at >least Carbon 1.0 installed: > > MacOS 8.6 or later > MacOS X 10.0 or later > >Anyone know for a fact one way or another? > >What happens if a user double-clicks an application with less than these >specs? Graceful "Sorry, no can do" from the runtime, or crash? Deep, I just compiled in Carbon (not Carbon/Classic) a loan amortization application I wrote to run in Panther under OS X 10.3.5, transferred it over our home network to my wife's old Beige 233 G3 running OS 8.6 and launched it. The result: Ran fine but upon saving the sample amortization table I created crashed giving me a "container out of memory" error-- most probably due to sloppy programing on my part and/or the fact that I did not allocate extra Classic system memory in the app. Not definitive, but it certainly appears that a minimal application built with FB4 can indeed run on OSes as old as 8.6. Ken p.s. My wife's System 8.6 has CarbonLib Update 1.6 and the Appearance Control Panel 1.1 dated August 24, 1998, for OS 8.5 installed.