Returns:
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Returns TRUE if the line at line-ptr is the indicated type, or FALSE if it is not or if the line-ptr is invalid.
The IS_xxxx function exists in the following forms:
Is_Bnds(line-ptr)
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a =BNDS> line
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Is_Bottom(line-ptr)
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the Bottom of Data line
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Is_Cols(line-ptr)
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a =COLS> line
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Is_Data(line-ptr)
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a normal text data line
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Is_File(line-ptr)
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a =FILE> line
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Is_Mark(line-ptr)
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a =MARK> line
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Is_Mask(line-ptr)
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a =MASK> line
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Is_Note(line-ptr)
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a =NOTE> line
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Is_Prof(line-ptr)
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a =PROF> line
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Is_Tabs(line-ptr)
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a =TABS> line
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Is_Top(line-ptr)
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the Top of Data line
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Is_ULine(line-ptr)
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a User line
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Is_XLine(line-ptr)
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an excluded line
(usually, but not always, a data line)
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Is_XMarker(line-ptr)
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an excluded line marker
(the dashed "placeholder" line)
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Is_Word(line-ptr)
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a =WORD> line
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RC will always be 0 and Msg$ will be "" (Null)
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