PHP Memory Limit shared or not?

[Jain Farstrider]

I would like to know if my PHP Memory Limit is assigned to each database/forums.

lets say I have two separate forums and my PHP Memory Limit is 100MB, do the two have 100mb each using up 200MB of server memory or is it divided into 50MB cos total is capped at 100MB?

Asking cos in admin, I see full PHP Memory Limit on two different boards and am not sure as the PHP Memory Limit is set in WHM rather than in the independent .php or cPanel.

[nhawk]

The memory limit is PER SCRIPT, not per site or per server.

So if you have 10 scripts running at once, you can use up to 1000MB when the limit is set to 100MB.