This command is similar to talk but is not as formal. When you "write" you
are writing directly to someone's screen instead of engaging in a set talk
session. To have this command function, you and the person you are writing
to must have their "write" permissions on. To accomplish this task, type: 

uxl> mesg y 

To then write something to someone, you would type:(to
zack@magic.nowhere for example)

ux1> write zack@magic.nowhere

and then you would have a blank line on which to type. At the end of each
blank line you would need to hit return, and then the line would show up
on their screen. This function can be very annoying and you may not want
to have your write permissions on very often.