In looking that the current implementation of the wire library (I2C) it does not appear possible to link an Arduino 101 board to another Arduino 101 or other Arduino.
In the current implementation of the Curie Wire library the begin function is defined as:
void TwoWire::begin(void)
while the AVR implementation defines it as:
void TwoWire::begin(int address)
The AVR implementation allows you to set up an address on the slave Arduino to allow communication over the I2C bus. Reference: Master Writer/Slave Receiver tutorial.
If this is not how it is implemented on the Curie please let us know how this works. If not implemented suggest that this become a priority.
Also a setclock function is required as it does not appear to be implemented. This should be relatively easy to implement in the current library. In addition other I2C issues that are being discussed in the forum should be addressed as well.
Regards
Merlin513
Update: 3/14/15 (EST)
Ok. Dung a little deeper into library it appears that instead of defining it in wire.begin you define the address in wire.requestFrom.