[libvirt] login and password in connection string for vmware hypervisors...

Hi, I want submit commands against a VMWare hypervisor via virsh in a non-interactive way. I can connect to my [remote] hypervisor via virsh as follows: virsh -c gsx://ic-p19-01?no_verify=1 then, it asks me for login and [root] password and I'm in. What mechanism can be used to submit commands, e.g. virsh -c gsx://localhost?no_verify list --all, with no password at all? A modified version of the connection string is required? what is the structure of that connection string? Additional parameters to the 'virsh' command? Thank you,