Technically speaking, Remote Buddy tells a behaviour that it is now 
the active behaviour. The behaviour can then decide what it wants to 
do to finish its setup. In most of the cases, this is to look for a 
running copy of an app or launch that app if it is not already 
running. But it could be something totally different.

In the Audio & CD/DVD behaviour, for example, it just sets up some 
required system structures to offer best performance during its use 
lateron.

Since a behaviour can do anything in its setup routine, using the 
"launch" verb would not always be appropriate - while "activate" 
always is.

Best regards, 
Felix