zd421 kbase 
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15659 - set print method to direct thermal through embedded web server 
15431 - print network configuration page 
15429 - manual print darkness adjustment
14903 - adjust print width through embedded web server 
15782 - run a smart cal media calibration 
15420 - adjust print width manually 
15658 - locate the serial number 
15432 - network configuration reset 
15456 - zebra zd421 standard interface controls overview 
15444 - hardware overview 
11051 - set static ip address for gk420 and zd421