GRC example using a single USRP2 with WBX for simultaneous OFDM transmit and receive

Hi,
I have a USRP2 + WBX board, and would like to use GRC to simultaneously
transmit and reveive OFDM using a single unit.

Is it possible to have a single GRC file launch two windows and run the
transmission and reception using a single WBX board at the same time?

Best regards,

Elvis D.