If you are creating a window for a help library (a .HLP file), you must use the res= attribute to assign an identifier to each window. For example:

:h1 res=2001 id=2001 global.
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IPF uses the value specified for res= (any integer from 1 through 64 000) to associate a window with a user's request for help on a field or window of the application. If you use the res= attribute in a heading tag, you must also use it in a link tag when defining a hypertext cross-reference to the window. For example:

:link reftype=hd res=2001.
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:elink.