@steve02081504 Using the standard system dictionary, I wrote the following to OnSecondChange and it worked.

OnSecondChange
{
if !RAND(4) {
SHIORI3FW.PushAdditionalReturn('ValueNotify','\![set,tasktrayicon,k/.ico,Taromati2,--duration=100,--runcount=1]')
}
}

Directory structure:
ghost/master/k/0.ico
ghost/master/k/1.ico