sure, i know about that command, but inside mIRC help there stand:
/scid <-rsatM | N> [command]
Changes the active connection for a script to connection id N, where N is a $cid value.
The /scon command works in exactly the same way, except that N represents the Nth connection, not a connection id value.
so, where is the bug? mIRC help file or mIRC it self?