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According to the documentation, IClamp is a single pulse current clamp point process. I need IClamp to generate several pulses (variable intervals). Is this doable without generating multiple point processes and setting each process corresponding delay time? I tried to use Netstim and then use NetCon to connect them, but I failed. Any suggestions?

Good question. See
I just want a current clamp that will deliver a sequence of current pulses at regular intervals.
in the FAQ list
https://neuron.yale.edu/neuron/faq/general-questions

This is also mentioned in the Hot tips area of the forum under
How to make IClamp deliver multiple pulses or a waveform

Thanks. works perfect!