Changes schematic cursor to a shape depicting an oscilloscope probe. Returns when the user presses a mouse key. If the left key is pressed return value is 1 otherwise it is 0. Probe returns on both up and down strokes of mouse key. See Cross probing for an example of using the Probe function.
No arguments
Return type: real
1 if left button clicked, 0 if cancelled (right button or escape)
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