FLC OF C560 CITATION ON DEMO FLT CROSSES RWY TO WHICH THEY ARE CLRED TO TAXI AND HOLD. GND CTLR INFORMS THEM OF THE ERROR AND ISSUES NEW CLRNC.

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THE ACFT WAS BEING OPERATED AS A DEMONSTRATION FLT. THE PLT AT THE CTLS WAS SIC QUALIFIED AND WAS TAXIING THE ACFT. OUR CLRNC WAS TO TAXI TO RWY 22R. AFTER ENSURING THE TAXI INSTRUCTIONS WERE UNDERSTOOD; I WENT 'HEAD DOWN' TO COMPLETE THE BEFORE TKOF CHKLIST AND PROGRAM THE FMS. DURING THIS TIME; THE PLT TAXIING PROCEEDED ACROSS RWY 22R AND STOPPED SHORT OF RWY 22L. GND CTL INFORMED US OF OUR ERROR AND CHANGED RWY ASSIGNMENTS. THE CHAIN OF EVENTS STARTED WITH A PLT WHO WAS UNFAMILIAR WITH THE AVIONICS OF THIS PARTICULAR MODEL TAXIING WHILE ATTEMPTING TO LEARN THE SYS. AT THE SAME TIME; THE UNFAMILIAR CREW PAIRING; COUPLED WITH THE ATTEMPT TO DEMO THE ACFT; ALLOWED A BREAKDOWN IN COMS. THE EVENT THEN OCCURRED WHEN THE MORE 'SITUATIONALLY AWARE' PLT WAS NOT ACTIVELY MONITORING THE COURSE OF THE FLT. A TERTIARY; AND NOT SIGNIFICANT FACTOR; WAS THE RWY MARKINGS AND WIDE OPEN TXWY WHICH DO NOT INITIALLY APPEAR TO BE A RWY TO THE 'OTHERWISE OCCUPIED.' IN THE FUTURE; I WILL: ENSURE ALL TAXI INSTRUCTIONS ARE COMPLETELY UNDERSTOOD; NOT ALLOW MYSELF TO BE RUSHED JUST TO MAKE THE DEMO SEEM EFFORTLESS; MONITOR THE OP AT ALL TIMES; AND UTILIZE THE TIME WHEN THE ACFT IS STOPPED TO PROGRAM SYS AND RUN CHKLISTS.