The Select Hold Type dialog box is for specifying the SET of hold types to
look for in a job, when limiting the jobs appearing on the Jobs listbox in the
main xpbs window.

Simply click on any of 3 toggle buttons to specify u (user), o (other), and
s (system) for the hold types string.

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COMMAND BUTTONS
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This region of command buttons represents the final step when manipulating this
dialog box. 

Click on "ok" when done setting widget values. This is also the default action 
when the <Return> key is pressed.