To pulse a parameter is to send it a signal from a CHOP or python or a mouse click that causes a new action to occur immediately.

Some parameters are specifically Pulse-type parameters such as Reset Pulse in a Speed CHOP. A pulse via python is via the .pulse() function on a pulse-type parameter, for example op('speed1').par.resetpulse.pulse().

A pulse from a CHOP is typically a 0 to 1 to 0 signal in a channel exported to the Pulse-type parameter.