This will tell you what remote users have a file open over an SMB share. Just thought it might be helpful. Doesn't use the API directly, this is with WSH.

	*	Determine who has a file open - VFP7/SP1 , WSH5.6
	*	Use to protect or take action for a table that someone might have open over the network
		Clear
		Local iRow as Integer
		Local cConnstring as Character
		Local oThing as Object	
		oNet = CreateObject("Wscript.Network")
		cConnString = "WinNT://" + oNet.ComputerName + "/LanmanServer"
		oFSO = GetObject( cConnString )
		iRow = 1
		Dimension arResources[iRow,2]
		For Each oThing in oFSO.Resources
			If Vartype(oThing.User) = "C"
				arResources[iRow,1] = oThing.User
			EndIf
			If Vartype(oThing.Path) = "C"
				arResources[iRow,2] = oThing.Path
			EndIf			
			iRow = iRow + 1
			Dimension arResources[iRow,2]
		Next		
		Display Memory like arResources

Any comments on how to tweak this are appreciated.