Replication Slave status from Master

[PER JØ'RGENSEN]

Hi Forum.
I'm running a littel testsetup with MySQL replication.
the setup will be a little tricky in the end - but here's a little explanation:
The MasterDB is onboard A Vessel and collects data from the Vessels Instrument.
in a timeperiod of 3weeks - the 2 weeks will be with normal internet - but the last week its only possible to mail - no replication.

The question is now:
how can I from the master see/determine if the slave is connected?
I'll make a bat script, that test if the Slave is connected to the master:
If the slave is connected - EXit the script
if the slave is not connected - run command FLUSH LOGS;

I've tried to google the command for this and this is where it goes wrong.
As far as I can see the command should be like this:
SELECT COUNT(1) FROM information_schema.processlist WHERE command = 'binlog dump';
But this gives me the same count weather the slave is connected or not:
the returned count from this command is "1" weather the slave is running or not.

How can I from the Master get a boolean value true/false - or 0/1 if the slave is connected or not.

Thanks in advance
P