Usage: CLIENT <class> MASK ADD [<mask>]

This allows you to add a hostmask to the specified Client Class.

/as client WebMaster mask add *@*

The mask is in the form of userid@domin *@* will let anyone on the server from the domain. *@ will let anyone on from localhost. userid's can be handy to descriminate against which page a user is coming from on the java client, so you could have support@* and sales@* if your java userid was set to support or sales.