I do not know what is the system here, but India that is the system. You have to send your card, and the . . . if doorman takes away that card and the permission comes, then you can go in and see. Similarly, when Brahmā came, he sent his card, informed the doorman, "Please inform Kṛṣṇa that I have come to see Him."
- kṛṣṇa kahena-'kon brahmā, ki nāma tāhāra
- dvārī āsi' brahmāre puche āra bāra
- (CC Madhya 21.59)
As soon as the doorman told Kṛṣṇa that, "Brahmā has come to see You," Kṛṣṇa at once replied, "Oh, which Brahmā? Which Brahmā has come to see Me?" So:
- vismita hañā brahmā dvārike kahilā
- 'kaha giyā sanaka-pitā caturmukha āilā
- (CC Madhya 21.60)
When the doorman inquired that "Which Brahmā you are, sir?" so he replied . . . he was astonished: "Which Brahmā? Oh, I am so powerful. I have got four heads. I have created this gorgeous universe, and under me there are so many demigods. How is that, 'Which Brahmā?' So all right, Kṛṣṇa has asked. Tell Him that . . ." kaha giyā sanaka-pitā caturmukha āilā, that "Tell Kṛṣṇa that I am four-headed Brahmā. I am the father of Sanaka-Sanātana."
Sanaka-Sanātana . . . he is giving his identification as father of Sanaka-Sanātana, because this Sanaka-Sanātana appeared to be greater than Brahmā. Although these four Kumāras were sons of Brahmā—Sanaka, Sanat-kumāra, Sananda and Sanātana, these four Kumāras—they were so elevated that when their father requested—at that time there was no population—so, that "You get yourself married and increase population. I want population now to fill up this vacant position of this material world, universe," so they refused: "Father, we are not going to marry. We are not going to entangle." So they remained kumāra. So they became very famous, great devotees of Lord from very childhood.