Logs in to the LINCKS database system, prompting for user id and pasword on stderr and /dev/tty. and starts up the connection to the database `dbid'. See also NOPROMPT_LOGIN().
Login names and passwords should be set in the file passwd, by using the 'dbpasswd' utility. The passwd file has this format:
'login name' 'user id' 'password'
Each user should be on a separate line.
Function returns: