setting up ISD51 for code debugging

I am not able to implement ISD debugging system on the target ie 8051RD2.
I have copied & included ISD51.a51 and ISD51.h in the project.
I have compiled and loaded the hex file in target.

1) Now how should i conform the working of ISD with my system ?.

2) what should be the response on resetting the target ?.(ie will it start its normal execution or
ISD routines starts executing for setting up communication with keil IDE in debug mode).

I have routine which initialises UART(115200 baud rate,11.0592 Mhz crystal,Timer 1 is used
as baud rate generator loaded with 0xFF,CPU is 6 clk cycle) at the beginning.
serial cable which is connecting the COM port of PC to target CPU is having rx,tx and gnd wires.
On starting Debug mode,Under the "peripherals" option,"serial",UART is configured to baud rate 115200.

3)So now on single stepping when " ISDinit()" routine is executed debugger will try to establish
communication with the taget system.or is it so that debugger will try to establish communication
with target system when it enters in the debug mode.

4)How does Debugger updates its registers ? with ISDcheck() or ISDwait() ? or process is
transparent to us !!

5)How to use ISD with clock 12 8051RD2.
Maximum baud rate possible is 57600 (11.0592 Mhz Xtal),but in debug mode of Keil IDE,UART
configuratin shows 115200 baud rate.Are there any option to set clock speed so that baud rate are
same for target CPU and Debug mode UART configuration.

help!!! setting ISD to debug system code.

Following is the code:

 
#include <stdio.h>
#include <reg51.h>
#include "ISD51.H"  

sbit     ok_led      = P2^7;                  
sbit     error_led   = P2^6;                  
sbit     place_led   = P2^5;

extern void init_UART(void);  

void main()
  {
   init_UART();
   while(1)
     {
      #if 0     
      ISDinit();
      #endif

      printf("\nISD debugger Demo \n");
      
      #if 0   
      ISDwait(); 
      #endif 
      ok_led      =0;            
      error_led   =1;
      place_led   =0;
      _getkey();         
      
      #if 1 
      ISDcheck();    
      #endif  
      ok_led      =1;
      error_led   =0;
      place_led   =1;         
      printf("\n\n\n\n\"ISD Demo over\" \n");
     }
   
  }

void init_UART()
{
      SCON = 0x50;      
      TMOD |= 0x20;
      PCON = 0x80; 
      TH1 = 0xFF;             //115200 baud rate with clock 6 CPU at 11.0592 Mhz  
      TCON = 0x40; 
      TR1=1;  
      TI=1;
      EA=0;                  //disable all interrupts       
}