If you would like to take screenshots do this- hold down the shft, ctrl and alt keys and then press the V key. it will snap a shot of whatever is on the screen in a .RAW format. This procedure will also work for USNF. To convert it to .BMP or .JPG, download the usnfview.zip file on my ATF page. (Not just for USNF).
The following were submitted by Stanislav Strokash
If you would like to take screenshots in Microsoft Flight Simulator 98 just press print screen or ctrl + print screen keys. This will copy that image to your clip board. Next open up your favorite paint program and paste it with the paste command. Save it from there and you have a screenshot.