CTSHolding is a property of the Comm32. The MSComm32 compatible Communications OCX

Introduction
Install SComm32
Why Not MsComm?

Properties
   .Break
   .CDHolding
   .CommEvent
   .CommName
   .CommPort
   .CTSHolding
   .DSRHolding
   .DTREnable
   .EOFChar
   .EOFEnable
   .Handshaking
   .InBufferCount
   .InBufferSize
   .Input
   .InputLen
   .InputMode
   .NullDiscard
   .OutBufferCount
   .OutBufferSize
   .OutPut
   .OverlappedIO
   .ParityReplace
   .PortOpen
   .RThreshold
   .RTSEnable
   .Settings
   .STHreshold

OnComm Event
Hardware/Cables etc

CTSHolding

Retrieves the state of the CTS line.

Not available at Design Time - Read Only at Run-Time

	Syntax	value = object.CTSHolding

	object	Name of the communications control.
	value	A boolean expression indicating the state of the CTS line.

	Example
		if object.CTSHolding Then MsgBox ("CTS is On") Else MsgBox ("CTS is Off") End If

Remarks:

CTS is used by the Com port for RTS/CTS flow control.

You can use this property to check the state of the CTS line. For example when using RTS/CTS flow control you could check that you are 'Clear to Send' before queueing data into the transmit buffer.

32bit development in VB6 using the Comm32 Communications OCX ?

Or are you looking for a proper .Net Component ?

Carry on using most of the common and well documented MSComm32 syntax but with a proper .net component allowing you to build x86, x64 and AnyCPU projects using Visual Studio 2005, 2008 and 2010.