======Synopsis:======
$__isencrypted__(<server refnum>)

======Arguments======
  - <server refnum> : integer (Optional) - A server refnum.  Defaults to the current server

======Return value====
^ Return Value ^ Condition ^
| 1 | The server refnum is connected to irc and is using an SSL/TLS socket |
| 0 | Any other condition (refnum is invalid; not connected to that server; not using ssl with that server) |

======See Also======
Since 0 can mean several things, you can use [[serverctl]] to see if a refnum is invalid, or if the
server is not connected yet.

======History:=====
This function was part of EPIC-SSL.  It first appeared in EPIC4-1.1.3