HP RPG/XL Programmer's Guide (30318-90001)

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Figure 8-7. The System-Defined Job Control Word (JCW)
User Switches are assigned values depending on their relative bit
positions in the Job Control Word (see Figure 8-8). You can test and
change User Switch settings using decimal or octal notation. For
example, to see if user indicator U1 is turned on, you can test JCW=128
(decimal) or JCW=%200 (octal).