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yaa ali mehemaan-khaane me(n) moman ku(n) jab, laae id musale
shamasi jo salavaat paddh-kar, maaraphat ki khushiyaali...........7

O Ali, when the believers in the guest-house celebrate this occasion as at Id, they recite the Shamsi prayer and experience the delights of spiritual enlightenment.

What is the Shamsi prayer

Faisal

As the verse states, it is salwaats to express their delight of spiritual enlightenment.

There is an article on Munajaat which can be referenced at:

http://www.ismaili.net/Source/mumtaz/munajat.html