Finding Dell Express Service Code on Remote Machine

Hi All

I have one domain 3 sites over 100 dells workstations. I have the IP address host name and VNC access to the machines. I am trying to find a solution where i can get service tag info from all of the machines without visiting. My method was to UNC to a workstation \\computername\c:\Dell\Express.exe

when this opens up instead of giving me the right info it gives me the service code info of my local machine… i called and spoke to dell and they weren’t able to come up with any solutions. i really dont want to visit each workstaions or VNC into it as i dont want to disrupt the very busy people working on them…. Is there an easier method???