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No arguments accepted.
This procedure returns the status of the right or left shift keys as a string.
If either the right or left shift keys is depressed when this call is executed, it returns a string containing the character "1." Otherwise, the character "0" is returned. The shift status may not be correct if event processing is frozen due to a "grab."
# If the shift is depressed, add to a set of previously
# selected nodes those nodes having the name "mynode."
# If the shift is not depressed, the previously selected
# nodes are deselected.
rcl_select_name mynode [rcl_isshifted]
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