Windoze XP tends to automatically free it's RAM, which I don't like really.  Could be good, but not when you've been editing your song in Cubase for about an hour, then go back to Pulsar OS for some adjustments:  WinXP needs to load the whole GUI again to the memory.
Here's a snapshot of what happens in the memory.  The initial drop of free RAM is right after opening of Pulsar and Cubase, the RAM freeing happens after a while when working in Cubase.
 
So I made an entry in the system.ini:
[386 Enh]
ConservativeSwapfileUsage=1
This setting will tell Windows not to use the swapfile at all until all of the RAM is used.  I found only that it's for Win98, to use it's Virtual Memory like Win95 does.  I haven't monitored mem usage on XP lately, but it doesn't seem to give any probs 
