B2 Spice v.5 Cross Probing
New for B2 Spice A/D v5 is the ability to cross probe circuits. In addition to the voltmeter, ammeter, and markers that traditionally designate node to display on the output graph, probes can also perform this function.
Just place probes at the desired points on your circuit and run the Test of your choice. The resulting graph will automatically display the node voltages/currents designated by the probes.
What
sets the probes apart from markers and meters is the ability
to update the graph display by moving the probes around the
circuit. Relocating the probes to a new location will update
the graph to reflect the new voltage or current according to
the location of the probe.
Also, adding new probes will also add the resulting node voltage or current plots to the graph.

See a movie of B2 Spice's cross-probing in action