<http://schema.org/description>
"Custom macro B enables users to read and write data into accessible registers, whereas G10 code permits writing into all offset registers. But which option is best for applications that only require the ability to write data?"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.mmsonline.com/columns/system-variables-versus-the-g10-command>