/** Enable a snomask.
* @param letter The snomask letter to enable. Once enabled,
* server notices may be routed to users with this letter in
* their list, and users may add this letter to their list.
* @param description The descriptive text sent along with any
* server notices, at the start of the notice, e.g. "GLOBOPS".
/** Enable a snomask.
* @param letter The snomask letter to enable. Once enabled,
* server notices may be routed to users with this letter in
* their list, and users may add this letter to their list.
* @param description The descriptive text sent along with any
* server notices, at the start of the notice, e.g. "GLOBOPS".