Hi everyone!
As Arturo said, hope you are all influenza free ;).
I just figured out how to make both robots run programs. I had to modify the lab2piso.cfg file (I created a lab2piso.2.cfg file) and defined two different models, one for each robot with two specific ports like so:
driver
(
name "vfh"
provides ["6665:position2d:1"]
requires ["position2d:0" "laser:0" ]
)
# robot2
driver
(
name "stage"
provides ["6666:position2d:0" "6666:laser:0" "6666:sonar:0" ]
model "robot2"
)
driver
(
name "vfh"
provides ["6666:position2d:1"]
requires ["position2d:0" "laser:0" ]
)
Then, I looked into laserobstacleavoid's code and noted the library "args.h". Inside this library there is a function called print_usage which tells the parameters you can provide to the program. In this way, according to the ports I determined for each robot I execute the laserobstacleavoid program for one of them in this way: ./laserobstacleavoid -p 6666 and for the one whose port is 6665 I executed the example we created previously in this way: ./example.0.1.2.
In the case of example.0.1.2 it is automatically executed in te robot whose port is 6665, however if I add the "args.h" library I suppose I could execute it for both robots using -p.
Here is a screenshot of the two robots navigating in the lab2piso.world.

See you!
Laura