w shows phantom user

Hi
When i use "w" command, It list some users with "-" command. That means these use already logout,but still in the system somewhere, no process but list under the "w" and "who" command.How can i get rid of these user. Can anybody help me out.thanks a lot

xiko

the output of "w" like :
#w
06:13PM up 36 days, 23:26, 13 users, load average: 0.13, 0.40, 0.54
User tty login@ idle JCPU PCPU what
test pts/26 Thu11AM 1day 0 0 -

Looks like there is only one user logged in, and that would be you!
To get rid of the user, log out ;0)