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So I was able to figure out how to do what I wanted and this is the current solution I have so far:

workstation --> xbee-pro-pkg_modem and turtle_laptop --> xbee-pro-pkg_modem

I simple have the modem connected to the USB ports of each computer and then I use:

slattach /dev/ttyUSB0

open a new terminal:

ifconfig sl0 [ip_addr of yourself] pointopoint [ip_addr of other computer] netmask 255.255.255.0

** make sure you run the above commands on each computer and then you should be able to ping eachother and ssh from one computer to the other. with this setup running roscore and the other turtlebot software should work.

hopefully someone else finds this useful!