SKTT=surat keterangan tempat tinggal...a residency card...like a KTP for foreigners on KITAS
Yea and it is valid for 3 month (or something like that was now on mine !!) . Looks like KITAS card (same format), piece of green paper size of ID.
It is needed for this and that ... (in my case they asked it to renew KITAS)
I could not make KITAP (permanent 5 years stay permit) because my spouse need to have adress in KTP same as the office where we apply for KITAP .. and that was not the case ! For 1y KITAS do not need match adresses !! ... So I am now on my 3rd KITAS (3y in a row)
2 more years (5 in total) and I might be able to apply for Indo ciztizenship .. I guess !? ... If they do not change something in meantime ...