Noob: Creating A Dll?

Can I create a .dll that other programs can use and if so, is there a walk through somewhere to do it? Thanks.

You can create DLLs with BMK via command line or using BLide.

I think the commandline is something like:

bmk makelib mysource.bmx

*EDIT*
this might help a bit:
http://www.blitzbasic.com/Community/posts.php?topic=66616#744477

You have to define the functions with "win32" and place a GCEnter sentence at the begining of the function to activate the garbage collection.
Example:

Function DoThis:int(Value:Long) "Win32"
   GCEnter()
   Return Value*2
End Function

Thanks! Ziggy - Every function I create has to have GCEnter()? What is this doing? What about GCLeave()?

GCEnter enabled the garbage collector. when the DLL is used from an application (let's say a C application), GC won't be running when a function in the DLL is called, so the objects won't be released when de-referenced, causing memory leaks unless you add the GCEnter() command.

ok, thanks for the info. :)

I guess you know creating dlls in BlitzMax is an experimental feature, you might want to use a compiler thats designed for it.