You have to explicitly set the resources to enable Schemes, without those, you just get the default colors (i.e. blue).
SGI: Development
Have launched another project on source forge - Page 2
This looks like the ticket:
http://techpubs.sgi.com/library/tpl/cgi-bin/getdoc.cgi/0650/bks/SGI_Developer/books/IIDsktp_IG/sgi_html/ch03.html
IRIX Interactive Desktop Integration Guide
Chapter 3. Using Schemes
http://techpubs.sgi.com/library/tpl/cgi-bin/getdoc.cgi/0650/bks/SGI_Developer/books/IIDsktp_IG/sgi_html/ch03.html
IRIX Interactive Desktop Integration Guide
Chapter 3. Using Schemes
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