I am a bit surprised that the problem I have encountered with the newer HP printers (4000T, 6P)causing PC lockups after 2 - 4 print jobs within VFP6 has not been identified as a serious problem. Thanks to replies from Cetin Basoz & Marcus Manson, I was able to identify the problem.
HP laser printers have to be the most widely used brand in most businesses.
I checked the VFP6 site to see if this problem was documented, possibly with a solution. As far as I could see, it wasn't. I have let them know about it.