You absolutely could dual boot them. I did it at the time. I reviewed BeOS 5 at the time: archive.org/details/PersonalComputerWorldMagazine/PCW%20200007%20Jul

You absolutely could dual boot them. I did it at the time. I reviewed BeOS 5 at the time: archive.org/details/PersonalComputerWorldMagazine/PCW%20200007%20July%20Created%20From%20PCW%20Cover%20CD%20%28No%20Cover%29/page/n50/mode/1up