Let's go for this short example :
code:
$User=GetObject("LDAP://CN=testattr,OU=testattrib,OU=testcitrix,OU=Informatique,OU=Siege,DC=w2k,DC=cram10,DC=cnav")
?$User.fullname
$User.fullname=""
$User.SetInfo
?@SERROR
Get $x