The ON JOIN event triggers when the mIRC client, or a remote user, joins a channel.
Note: When you join a channel yourself, $nick($chan,0) is always 1 inside the on join event because mIRC has to send /names to get the nickname; if you want to undertake some processing once the channel user list is complete, then use RAW 366 which indicates the end of the user list. Similarly, if you're an operator on the channel, you won't be opped inside the on join event, and should use ON OP event instead.
<level>The level for the event to trigger.
<#,[,#]>The text that to be matched. Can also be a wildcard.
<commands>The commands to be performed when the event listener's criteria is met.
The above example makes use of the ON ME event, which triggers only when the local mIRC client triggers the event, not remote users.
When a user joins, send them a greeting:
Added: mIRC v2.1a
Added on: 28 Feb 1995
Note: Unless otherwise stated, this was the date of original functionality.
Further enhancements may have been made in later versions.