I did a very small amount of testing:
I clicked to launch the game, but did not log in. On starting, the game occupied 139,584K. After 10 minutes of sitting idle, it was 139,620K. Then I CLOSED it (clicked Quit). PSClient.exe was still listed in Task Manager, although the game window closed. It was still using 47,056K. After another 10 minutes, it was still loaded, and still using 47,056K.
To Summarize:
Load: 139,584K
Idle: 139,620
Post Quit: 47,056K
I\'m using:
WinXP Pro SP2
768M RAM
Intel Graphics
Hope this is helpful.
Chad
