Netbeans - Remote debugging in windows environment

I am wondering if anybody here has the same environment than I use at present:

1 PC: host - WindowsXP - xampp - Netbeans -> everything works perfect incl. debugging in Netbeans

2 PC: client - WindowsXP - Netbeans -> used sometimes to work on the files (via shared folder) - everything works fine incl. debugging but:

When I start the debugger on the client, I can not see the debugging line (green line) in the sourcecodefiles in Netbeans.

Thanks for your help