WTware RDP client

I am trying to supply the password for this cconnection to a tight vnc server in the configuration file.
The connection works with no "user = user:pass" specified and will prompt only for the password.
If I specify "user = :pass" it says invalid user. to my knowledge there is no user name I can pass so how do I tell WTware to only send the password component?

Thanks,

Bit...

Syntax checker will be happy. Password will be used. User name will be ignored.

This worked perfectly

Works perfectly