Detect if PDA connected msg box if not

I'm trying to work out how to find out if theres a PDA connected. The first attempted connection to the PDA is as below:

	${PPC-registry::CeRapiInit} $R0



	${If} $R0 == '-1'

               MessageBox MB_OK 'Remote device connection failed.$\n$\n\ Please reSync device and try again'

	${ElseIf} $R0 == '0'

                ; MessageBox MB_OK 'Connection Success'

               	goto CheckdotnetCFVersion

	${EndIf}

Should I be making sure that there is a PDA there before I try to initiate rapi? And if so, how?
Cheers

whoops, think i just worked it out

had to use

${PPC-registry::CeRapiInitEx} $R0

instead, it tries to initiate, and times out at 3 seconds if it doesn't succeed