Greeting

Respected scholars, as-salamu `alaykum. Some non-Muslims use the greeting of Islam  as-salamu `alaykum wa rahmatullahi wa barakatuh [Arabic for: May peace and Allah's mercy and blessings be upon you]. What's Islam's stance on that?aLso, is it permissible for a Muslim to use the same salutation to greet or answer the greeting of a non-Muslim? I know people who believe that this is permissible, and others who believe otherwise. Jazakum Allahu khayran.

Dear scholars, as-salamu `alaykum. How does a praying person return a greeting while performing Prayer?

Dear scholars, As-Salamu `alaykum. My question is as follows: Should one stand up to greet older people and when visitors enter the room or should one remain seated? Is there any evidence in Hadith for that? Thank you, for taking the time to answer this question.