open remotes (hold the ALT key type the r key)
add in this scripting

menu query {
&Autoload $1 logfile: loadbuf $1 $+(",$chat($1).logfile,")
&Reload Chosen logfile: loadbuf $1 $+(",$sfile($logdir*.log),")
}

click ok

in a message window you can choose to right click in the msg window and find the heading Autoload or the heading Reload

if the person's nick is the same as they always use then the autoload should work

if they are using a temp nick or an alternate nick choose the other one and select the log you want to reload