Manage 2 mendels from one computer at the same time

Hi, is there any way to manage 2 (or more) mendels with the same computer at the same time ?( by preference mac or RPi)
Is there any software you know of that supports multiple printers?

I don't know of two printers in one window, nor about other hosts, but I can open as many instances of Repetier Host as I want.

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Realizer- One who realizes dreams by making them a reality either by possibility or by completion. Also creating or renewing hopes of dreams.
"keep in mind, even the best printer can not print with the best filament if the user is the problem." -Ohmarinus

I gues is just a choice right com port for each printers.

yes I was able to open parallel sessions of pronterface in OS X in terminal

open -n /Applications/Printrun20140310.app

chose the right port and I can control both printers at the same time

Congrats

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Realizer- One who realizes dreams by making them a reality either by possibility or by completion. Also creating or renewing hopes of dreams.
"keep in mind, even the best printer can not print with the best filament if the user is the problem." -Ohmarinus