Understanding top and memory usage

[Philip Radford]

Hi All,

This is a question which probably applies to all unix based OS as well as 
FreeBSD.

When using the top command I get the following in regards to memory usage.

Mem: 223M Active, 970M Inact, 175M Wired, 50M Cache, 112M Buf, 73M Free
Swap: 3029M Total, 12K Used, 3029M Free

Can someone advise me which figure relates to actual physical memory which 
is available. I can't work out if it is the 970M Inact or the 73M Free (i.e. 
the last figure).

Any advise greatfully received.

Thanks

Regards
Phil.