Offer DMs an option to couple a message with a spot or listen check as a chat command.
#ifs<two-digit number> <message> for spot (e.g. #ifs20 for a DC 20 spot check)
#ifl<two-digit number> <message> for listen (e.g. #ifl20 for a DC 20 listen check)
#not <message> for everyone in the area, with no skill check.