Is it possible to run two different versions of Apple operating system (for ex. 10.6.8 and 10.9) on a MacBook Pro, either on the same disk or from an external hard disk? If so, where would I find the details?

Is it possible to run two different versions of Apple operating system (for ex. 10.6.8 and 10.9) on a MacBook Pro, either on the same disk or from an external hard disk? If so, where would I find the details? (In order to be able to use the older applications no longer supported in 10.9)

If you want to add a second partition to the internal drive (in Disk Utility, select the drive, then open the partition tab and just click the + button), you should first be sure that you will have enough room to accommodate whatever the second volume will be. I am currently doing this for Snow and Mountain Lion.
To get to whatever volume is not the startup disk, restart and hold down option/alt at the chime, which will bring up a selection of the two volumes. Use the left or right arrow keys to select it and then hit enter/return.

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