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 VolNumGet()
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 Purpose:
 Get the volume number.

 Syntax:
 iVolNum = VolNumGet( lpszVolName )

 Parameters:
 lpszVolName The volume name.

 Returns:
 A numeric value (signed short int).

 Description:
 VolNumGet() returns the number of the volume specified by lpszVolName.

 Returns NOVERRINT if an error occurs.

 Example:
 // To display the number of volume "SYS":
 iCurrVol = VolNumGet( "SYS" )
 if ( iCurrVol != NOVERRINT )
    ? "Volume SYS is volume number", iCurrVol
 endif