- copying multiple files to a remote host, and the uname I give has
 the same uid as another login uname:
 Forces login as the uname I gave for the first file, but forces
 login as the first uname found on remote host that matches
 the uid it found from
 the first successful login during subsequent file copies.

 ex: scp /etc/auto_home /etc/auto_master /etc/auto_opt sproot@design84:/etc

 first time I am asked for passwd for sproot, subsequent times I'm asked for
 passwd for root.  

 On the remote host, /etc/passwd contains both root and sproot entries, with
 root at the top of the file.  Both entries share the same uid.