Engraving two color Acrylic

Currently I just cut using a PDF generated from Visual Cadd V5.
Where can I find help concerning designing and engraving two surface Acrylic which has a base material of white and a top coating of black. I need to create line and character white on the black background. What software or can I use Visual Cadd PDF files? Noticed the online documentation has a blank chapter on Engraving. Thanks

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