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GetDialogBaseUnits()
Return the dialog base units used when creating dialog boxes
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Syntax
GetDialogBaseUnits()   -->   nValue

Arguments
None.

Returns
A numeric value containing both the width and height of the
base units.

Description
This function returns a numeric value containing both the
width and height (in pixels) of the dialog base units.  The
width can be extracted by the C4W_LoWord() function, and the
height can be extracted by C4W_HiWord().

The base units are derived from the system font.  To determine
the width and height of a control in a dialog, take the width
and height in dialog units, multiply by the values extracted
from GetDialogBaseUnits(), and then divide by 4 (for the
width in pixels) and 8 (for the height).

Example
? C4W_LoWord( GetDialogBaseUnits() )   // Result: depends on your system