Is the clipboard shared?
Can you multiselect files and start them so that the 68k application gets them as wbstartup args?
Can you start 68k applications from shell and pass arguments to them?
Can you drag icons to the 68k applications?
Do the 68k application appicons appear on the host desktop?
Can you share data between separate 68k applications?
Can you access the host filesystem transparently from within the 68k applications?
Can the 68k applications communicate via ARexx?
Does it support programs that run in multiple windows, with freedom to drag and resize the windows on the host desktop?
Can 68k apps open to specific host pubscreen, and can they jump between ones?
Can you run MUI 68k apps?
Can you run networking 68k apps?
