To be used by DIM clients - implements static methods relating to the Client
    Mainly Sending Commands to Servers.
    The methods sendCommand(...) will wait for the command to be actualy sent to the Server
    and return a completion code of :
        1 - if it was successfully sent.
        0 - if it couldn't be delivered.
    The exception beeing: if the user calls this method inside a Handler (infoHandler, serviceHandler,
    commandHandler and clientExitHandler) the command will be sent but without waiting for reception
    and the return code is not reliable (in order to avoid deadlocks).

    The methods sendCommandNB(...) are Non Blocking, i.e. they do not wait for the command to be sent. 

    They should be used inside callback routines to avoid deadlocks
 
Public Functions :

• static void setDnsNode ( char * node_name) ; Sets the DNS node name for a DIM client (the default DNS node name is taken from the environment variable DIM_DNS_NODE).
• static void setDnsNode ( char * node_name, int port_number) ; Sets the DNS node name and port number for a DIM client (the default port number is 2505).
• static char *getDnsNode ( ) ; Gets the DNS node name defined for a DIM client.
• static int getDnsPort ( ) ; Gets the DNS port number defined for a DIM client.
• static int sendCommand ( char * name, int data) ; //Send Integer as Command
• static int sendCommand ( char * name, float data) ; //Send Float as Command
• static int sendCommand ( char * name, double data) ; //Send Double
• static int sendCommand ( char * name, short data) ; //Send Short
• static int sendCommand ( char * name, longlong data) ; //Send longlong (64 bit)
• static int sendCommand ( char * name, char * data) ; // Send a Character String
• static int sendCommand ( char * name, void * data, int datasize) ; //Send a structure or a vector
• static int sendCommandNB ( char * name, int data) ; //Send Integer as Command
• static int sendCommandNB ( char * name, float data) ; //Send Float as Command
• static int sendCommandNB ( char * name, double data) ; //Send Double
• static int sendCommandNB ( char * name, short data) ; //Send Short
• static int sendCommandNB ( char * name, longlong data) ; //Send longlong (64 bit)
• static int sendCommandNB ( char * name, char * data) ; // Send a Character String
• static int sendCommandNB ( char * name, void * data, int datasize) ; //Send a structure or a vector
• static setExitHandler ( char * serverName) ; //Inform the Server that this client would like the Server to execute an ExitHandler when it dies.
• static addErrorHandler (DimErrorHandler *handler ) ; Instruct the Server to execute the virtual method errorHandler whenever the DIM server sees an error. If no errorHandler is declared the DIM server prints an error message.

• virtual void infoHandler ( ) ; The method to be overloaded by the user, DimClient can be used as a base class when the user wishes to handle multiple DimInfo Services using the same handler. Example.
• DimInfo* getInfo ( ) ; Can be used inside "infoHandler" in order to return a pointer to the DimInfo service currently beeing handled.