You could set the laptops to only ever download a copy and the PC to leave emails on the server for say 7 (or xx) days, that would mean the laptops will always see emails that they individually have not downloaded a copy of which have arrived in the last 7 (or xx) days.
or
Use IMAP. (
http://www.imap.org/) something I keep meaning to try - anyone know how to handle the switch from pop3 to IMAP?
or
For remote access use real VNC
www.realvnc.com