Custom button to connect HQ client

Hi all - anyone know of a way to make a custom button so that the polling exchange can be launched from the POS via a custom button?  

We want the cashiers to poll right after they Z out.  They are mobile and sometime forget to manually initiate the connection - if there was a button in the POS we feel they will more easily remember to process their worksheets before shutting down.

Thanks in advance,

Todd