Opening Cash Drawers in VB.Net

I have a VB.Net application which is deployed on Citrix. It uses
Crystal Report 8.5 for printing reports. One of my remote users has an
Indiana Cash Drawer connected to the printer port. When the crystal
report is printed the user wants her cash drawer to open. Can anyone
give me ideas as to how can I send a non-printable charater like
chr(33) to the drawer via the crystal report or otherwise to open the
drawer?

Thanks.
Shakil.