If this sliding window is left open, it will open again the next day. How can it remember that it was open? Same for doors. Is the only answer, auto-close?

//---/---/---/------------------------------------------//_______________________>>
vector      DIST    = <0,0,0.3>; //set movement amount and direction
float       SLEEP       = 0.3;      //set time between movements
float       VOLUME      = 0.8;      // sound volume, 1.0 loudest, 0.0 to disable sound
key         SOUND_OPEN  = "378b553c-d511-aab3-d220-c239a6d15ad3";
key         SOUND_CLOSE = "8ae0e71f-6763-067f-073b-b299d687bc98";
vector      oPos;
vector      cPos;
//---/---/---/------------------------------------------//_______________________>>
open()
{
         llTriggerSound(SOUND_OPEN, VOLUME);
         cPos = llGetPos();
         llSetPos(llGetLocalPos() + DIST);
         llSleep(SLEEP);
         llSetPos(llGetLocalPos() + DIST);
         llSleep(SLEEP);
         llSetPos(llGetLocalPos() + DIST);
}
close()
{
         llTriggerSound(SOUND_CLOSE, VOLUME);
         oPos = llGetPos();
         llSetPos(llGetLocalPos() - DIST);
         llSleep(SLEEP);
         llSetPos(llGetLocalPos() - DIST);
         llSleep(SLEEP);
         llSetPos(llGetLocalPos() - DIST);
}
//---/---/---/------------------------------------------//_______________________>>
default
{
    state_entry()
    {
         cPos = llGetPos();  // remember where we're supposed to be closed
         state closed;
    }  
    on_rez(integer start_param)
    {
        llResetScript();
    }
    changed(integer change)
    {
        if(change & CHANGED_OWNER)
        llResetScript();
    }
}

state closed
{
    state_entry()
    {
        cPos = llGetPos();
    }
   
    touch_start(integer total_number)
    {
        if ((llDetectedKey(0) == llGetOwner()) || llDetectedGroup(0))
        {
            open();
            state opened;
        }
        else
        {
            llWhisper(0,"Not allowed.");
        }
    }
    link_message(integer sender, integer num, string message, key id)
    {
        if(message == "Open1")
        {
            open();
            state opened;
        }
    }
}
state opened
{
    state_entry()
    {
        oPos = llGetPos();
    }
   
    touch_start(integer total_number)
    {
//---/---/---/------------------------------------------//_______________________>>
        if(llDetectedKey(0) == llGetOwner() || llDetectedGroup(0))
        {
            close();
            state closed;
        }
        else
        {
            llWhisper(0,"Not allowed");
        }
    }
    link_message(integer sender, integer num, string message, key id)
    {
        if(message == "Close1")
        {
            close();
            state closed;
        }
    }
//---/---/---/------------------------------------------//_______________________>>       
}

 I put that script into a linked prim (window) and when I clicked it the whole build dissapeared. Later, on the mini map, I saw a blue dot in the void outside the sim next door. It was the prim I put the script in. I took a copy and deleted the prim, went back and tried to rez the copied prim a couple of times... Nothing.

Came back 2 hours later.. 3 blue dots, same place, out in void of sim next door. Turns out the previous rez attempt  worked but placed the build 100 meters above me and the single prim out in the void, 3 times.

I created 5 prims, linked them and put the script into a child prim. Same thing happened.

Dunno if Im clear enough about what happened but I wouldnt link anything with that script in it.

Do you know why it goes wild?

I have tweaked the script to work with your windows in your tin shed at the sandbox island. I'll leave one set of said windows by your shed there. free to copy of course.