Just today, I noticed a padlock lock/unlock symbol on the plastic guard at the PTO end of the driveline on my Landpride RCR1548 - picture attached:

Right underneath the arrow symbols there's a small window where you can insert a screwdriver and turn a slotted plastic screw or bolt head. I looked in the operator's manual and there's no mention of this. Two questions:
1. What does this lock/unlock mean?
2. How can I tell if it's locked or unlocked? I can rotate a screwdriver to turn the plastic screw or bolt, but I can't see anything that tells me which direction it's facing.
I should have left well enough alone, since everything's been working fine, but now that I've messed with it I figure I better know what I've done.

Right underneath the arrow symbols there's a small window where you can insert a screwdriver and turn a slotted plastic screw or bolt head. I looked in the operator's manual and there's no mention of this. Two questions:
1. What does this lock/unlock mean?
2. How can I tell if it's locked or unlocked? I can rotate a screwdriver to turn the plastic screw or bolt, but I can't see anything that tells me which direction it's facing.
I should have left well enough alone, since everything's been working fine, but now that I've messed with it I figure I better know what I've done.