COM, DCOM and COM+

I know this thing have been asked quite a number of times here.

But searching this I have seen replies which either do not satisfy or go "Above my Head" replies.

Kindly someone in [i]very plain english[i/] tell me the differnce between the three.

Possibly give an example of three occcasions wherein we use the three, I would be very grateful.

Thanks

Cant get any simpler than this~

COM - used locally to allow objects (dll's and the like) to talk to each other.
DCOM - used between different physical bits of hardware to allow objects (dll's and the like) to talk to each other.

COM+ W2K version of the above combined to make life easier.

Thanks for putting it so plainly,

One though I am aware of that with DCOM can be used to communicate with Diff PCs, Dont know how to use it:(

Secondly when u say COM+ is W2K version, is it just the sme DCOM or some add. features?

Basically COM+ is the same, just a whole lot easaier to administer.

To use DCOM you need to use the DCOM Configurator, basically it allows you to Register a reference to the component

hi,
COM+ is a runtime environment for COM Objects.
it gives your objects a lot of services, like Transaction support, Object pooling, Loosly coupled event etc.
COM+ uses DCOM for communicate between remote clients.
COM+ is part of the COM infrastructure.