The term 'SEND AN IM TO' can be solved by the four letter word 'PING'. This is an acronym for 'Packet Internet Groper', which is a computer network tool used to test whether a particular host is reachable across an IP network. It is also used to measure the round-trip time for messages sent from the originating host to a destination computer. In this context, it is used to send an instant message to someone.