NoObjectFactoryException

Ive written some classes in slice that contain both data and getter methods for that data. In another class I define methods which take those classes as input parameters, like this:

class MyCommand {
    int mCommandId;
    int getCommandId();
};

class Transceiver1 {
    void sendCommand(MyCommand command);
};

class Transceiver2 {
    void sendCommand(MyCommand command);
};

Ive also got a concrete implementation of both Transceiver1 and 2 which takes care of Ice initialization. Both classes set themselves up as servers but Transceiver1 alone attempts to get a proxy to Transceiver2 and call sendCommand().

Everything compiles without a problem and even works to some small degree: If I run instances of Transceiver1 and 2 from one application, everything works beautifully - messages are sent and received. But if I run them as two separate applications and try to get them to talk to eachother, disaster strikes. Here's what I see from each application's perspective:

Transceiver1:
(acting as a client)

Sending test command...
Problem: Outgoing.cpp:478: Ice::UnknownLocalException:
unknown local exception:
BasicStream.cpp:1830: Ice::NoObjectFactoryException:
protocol error: no suitable object factory found for `MyCommand'

Transceiver2:
(acting as a server)

10/21/09 18:32:19.019 warning: dispatch exception: BasicStream.cpp:1830: Ice::No
ObjectFactoryException:
protocol error: no suitable object factory found for `MyCommand'
identity: Transceiver2
facet:
operation: sendCommand

I've read through the various threads that I could find on the subject and see that I should create an ObjectFactory to solve this problem.

My two questions are these:
#1 - Why does it work when both objects are running from within the same application?

#2 - I read in one of the other threads that if I remove the method declarations from MyCommand's slice definition, I will no longer need anObjectFactory. Is this true?

For various reasons, an ObjectFactory is not an option for me so I am trying to work around that if at all possible.