When you're under R, hitting 1 will give you the quest type choices of:
1) Zone wide quest flag
2) Player only quest flag
A zone wide quest flag would be something like, when the floodgates open, the whole zone is flooded until (still undecided) the zone resets or the mud reboots (I'm in favor of until the mud reboots).
Player only quest flag would be that only the player sees the new description - even in a group.
The Quest Keywords is the variable that you have set on the player so they get the new description.
Room Description is what they get when they have that quest keyword on them.
Any questions, feel free to ask.