The "world" reference is the actual address of the relevant MUSHclient world in memory. Since COM is an Object management system (hence the O) it deals in object (executable code). You can't "remember" it, the address will be different every time.

As for the .tlb file, I doubt you can use it in a script, it is for if you are writing a program in full Visual Basic. In that case it isn't necessary, just helpful. Here is an example. If you start up VB and open a new project, and then go to the Project menu > References, you can click the Browse button, and use that to add the mushclient.tlb file. After you do that you should see something like this:

Once you have done that then you can use the object browser in your project, and it will show you the names of all the MUSHclient script functions, and also hopefully auto-complete the names and arguments if you happen to use a MUSHclient world in your program ...

1. Start Visual Basic
   
2. Create a new ActiveX EXE project
   
3. Under Properties change the class "(Name)" field from "Class1" to "MC_class"
   
4. Under Properties change the project "(Name)" field from "Project1" to "MC_callback"
   
5. Go to the Project menu and click on References
   
6. When the References window opens click on the Browse button and navigate to the "MUSHclient.tlb" file that came as part of the MUSHclient download, then click Open.
   
7. Confirm that "MUSHclient" appears in the list of "Available References" and is ticked.
   
8. Open the Object Browser (F2) or use the View Menu -> Object Browser, and change the top combo-box to "MUSHclient". You will see "World" appear in the list of classes down the bottom of that window. Double-click on World and you will see all the supported world functions (eg. AddAlias, AddTimer and so on). Close the browser.
   
9. In the code window for the project type in a test subroutine:
   
   
Sub TestNote(theworld As World)
theworld.Note "This is a test"
End Sub

   
   
10. Go to the File menu and click on Save Project. Accept the suggested file names (MC_callback.vbp and MC_class.cls).
    
11. Go to the File menu and click on "Make MC_callback.exe".
    
    

1. Start MUSHclient and open a world
   
2. Make sure scripting is active - VBscript language
   
3. Type:
   
   
/dim testobject
/set testobject = createobject ("mc_callback.mc_class")
/testobject.TestNote (world)
/set testobject = nothing

   
   
4. You should see "this is a test" echo on the output window. What the lines above are doing is:
   
   
   • Making a variable "testobject"
     
   • Assigning to it a reference to the new class "mc_callback.mc_class" from your Visual Basic application
     
   • Calling the "TestNote" subroutine in that class. We pass to it the reference to our current world. The "TestNote" subroutine uses that reference to call "world.note"
     
   • By setting the testobject to "nothing" we release the reference to that world