The Sikh gurus established a mechanism which allowed the Sikh religion to react as a community to changing circumstances. The sixth guru, Guru Hargobind, was responsible for the creation of the concept of Akal Takht ("throne of the timeless one"), which serves as the supreme decision-making centre of Sikhism and sits opposite the Harmandir Sahib. The Akal Takht is located in the city of Amritsar. The leader is appointed by the Shiromani Gurdwara Pabandhak Committee (SPGC). The "Sarbat Ḵẖālsā" (a representative portion of the Khalsa Panth) historically gathers at the Akal Takht on special festivals such as Vaisakhi or Hola Mohalla and when there is a need to discuss matters that affect the entire Sikh nation. A "gurmatā" (literally, 'guru's intention') is an order passed by the Sarbat Ḵẖālsā in the presence of the Gurū Granth Sāhib. A "gurmatā" may only be passed on a subject that affects the fundamental principles of Sikh religion; it is binding upon all Sikhs. The term "hukamnāmā" (literally, 'edict' or 'royal order') is often used interchangeably with the term "gurmatā". However, a "hukamnāmā" formally refers to a hymn from the "Gurū Granth Sāhib" which is given order to Sikhs.