Digital BW, The Print

When calibrating a crt monitor (I guess a lcd is different?) on a PC 
running windows what settings should be used. According to computer-
darkroom/Ian Lyons, using OptiCal the Luminance white & black points 
are set to .3 and 90. The col temp to 6500K and the Gamma for a PC 2.2

Could the col temp be set at 5000K which I think is more of an 
industry standard. I think that prints should be viewed under the 
same light temperature as the monitor is set to?

For PC 's is the gamma standard 2.2 ? And for Macs 1.8 ?
What if I need to work with someone (provide files) who is printing 
from a mac, should my pc be set to 1.8 too or will the 
platforms 'talk to each other' if I'm on 2.2 and he is on 1.8 ?

And the white and black luminance points  .3 and 90 that are 
recommended..are these standards or ....???

thanks