Getting environment settings on Mac

[rgould8 at aol.com]

Can anyone tell me if there's a reliable way to get any of the following system variables on a Mac via Revolution?

MHz speed of the processor
Amount of available memory (heapspace command docs say it's not really a true value)
Amount of free hard-drive space
Whether or not an Ethernet card is available (that's true for just about all Macs isn't it?)