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When Riku reaches the Brink of Despair and is looking for a way into the Castle That Never Was, he spots Sora's Meow Wow trying to get his attention from the castle entrance. When his Komory Bat shows up as well, he realizes that they are there to help him across and uses the Dreamline to create a rope and cross the gap.
In Kingdom Hearts 3D: Dream Drop Distance, Dreamline prompts the user to slide the 3DS's stylus to connect the Komory Bat and Meow Wow together. Doing this creates a rope of light decorated by Spirit sigils, and Riku simply must use Flowmotion on it to make it to the Castle That Never Was.
In Kingdom Hearts Dream Drop Distance HD, activating Dreamline instead instantly creates a line between the two Spirits.