//@code
units(&t) // built in as "ms"
units("t")
units("ExpSyn.g") // built in as "uS"
x = 1
{units(&x, "mA/cm2")}	// declare units for variable x
units(&x)		// prints mA/cm2
proc p () {
	xpanel("Panel")
	xvalue("t")
	xvalue("prompt for x", "x", 1)
	xpanel()
}
p()		//shows units in panel
units(0) 	// turn off units
p()		// does not show units in panel