top memory usage question

[Coert]

Hello all,

Just a question, on Linux the output of top's memory usage looks like this:

Mem:   2075424k total,  1760848k used,   314576k free,   151872k buffers
Swap:  4192924k total,        0k used,  4192924k free,  1214052k cached


on FreeBSD:

Mem: 48M Active, 945M Inact, 190M Wired, 112M Buf, 804M Free
Swap: 4063M Total, 4063M Free


I have looked at the respective man pages, and googled.
Where can I find out what Active, Inactive, and Wired mean?


Thank you,
Coert