There is another thread that talk about Real-time programming using LabView. It also covers items such as PDA.
Try the following link:
http://exchange.ni.com/servlet/ProcessRequest?RHIVEID=101&RPAGEID=8&RFORMNUMBER=3&RHIDETAG=TRUE&UCATEGORY_0=_50&UCATEGORY_S=0
Good luck,
JLV