SPWW2 OpFire Filter Help

[Dolphin]

Can anyone help with a brief overview of the OPFire filter system in SPWW2. Do you 'Save' each setting with a blue icon for instance & what are the red icons for?

If you hover your mouse above the icon a text will appear at the top of the game screen. The red icons are 'load' icons and the blue are 'save'. So you change the settings you want and then click the blue icon (1,2,3) to save that filter. It can now be applied later by selecting the corresponding red icon (1,2,3). Also, you must apply the save to the units before exiting (via the icons below the red save) or else it won't take.

Thanks Weasel, that's clarified things. I take it that the save icon is the red up arrow?