The Transfer Window is a navigation system in Spaceflight Simulator. It has a Transfer Window node, and an Encounter Node. If you are navigating to a rocket, instead of Encounter, it will read Rendezvous. It has a dotted line that indicates the best trajectory of the rocket approaching the object, and a delta-v indicator to calculate how much fuel to burn to reach the object.
Transfer Node[]
The Transfer Window is where you will burn your rocket to that object. At the transfer window, burn prograde/retrograde to go to your target; there will be a delta-v indicator for how much propellant to burn to reach the object, and a dotted line to see what the trajectory looks like when done doing the burn. For example, if your spacecraft is going to another planet, and the delta-v indicator says +1200 m/s, it must burn prograde until it reaches the target. If the delta-v indicator has a negative number (say -300 m/s) it must burn retrograde to reach its target.
Encounter Node[]
At the encounter node, the spacecraft will end up where it is going at (a planet; a rocket).
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Set %planet% as the navigational target. Tap on the planet you are navigating to, and tap "Navigate To". When you reach the transfer window, burn prograde/retrograde to encounter the planet you are going to.
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Set %rocket% as the navigational target. Tap on the rocket you are navigating to, and tap "Navigate To". When you reach the transfer window, burn prograde/retrograde to reach the craft you are going to.
History[]
The transfer window was highlighted before 1.5, and it has a dotted line that shows the closest approach to that object. When 1.5 was released, the transfer window's dotted line was modified from the closest approach to the object to the orbit after the transfer burn.
See Launch Window to see more about the old transfer window.