1. One should not make salaam when greeting a non-Muslim. If a non-Muslim greets one with salaam, then one should reply by merely saying “Wa alaik” (and upon you), and if many non-Muslims greet one with salaam, one should reply by saying “Wa alaikum” (and upon you all).
2. When two Muslims meet, then after making salaam, they should make musaafahah (shake hands) with each other.