[XeTeX] Color and fonts

[stephenmoye at cox.net]

I sent this inquiry elsewhere when I should have sent it here. My apologies.

1. With version 0.4 there are new color facilities: x:textcolorpush/pop and x:
rulecolorpush/pop. I'm sure I'm missing something very simple, but how is 
color invoked in the first place and how are push and pop used, ie what is the 
format of the \specials?

2. OTF fonts (eg Adobe and Linotype): Is there a way to use these?

Thank you for any assistance.

Stephen Moye