sEOS running a dummy tast

Hi,

Please, any one can help me to explain the following function:
Q1) Function X_Init
Q2) Function X
Q3) Function sEOS_ISR()
Q4) Function sEOS_Go_To_Sleep

Code:
#include <reg52.h>

#define OSC_FREQ (12000000UL)
#define OSC_PER_INST (12)

void sEOS_Init_Timer2(const unsigned char);
void sEOS_Go_To_Sleep(void);
void X_Init(void);
void X(void);
void X_Init(void);

#define INTERRUPT_TIMER_2_Overflow 5

void main(void)
{
X_Init(); // prepare for dummy task

sEOS_Init_Timer2(60); // set up simple EOS (60ms tick interval)

while(1)
{
sEOS_Go_To_Sleep();
}
}

void X_Init(void)
{
// Dummy task init function
// Dummy task init...
}

void X(void)
{
// Dummy task called from sEOS ISR
// Dummy task....
}

void sEOS_ISR() interrupt INTERRUPT_TIMER_2_Overflow
{
TR2 = 0;
X();
}

void sEOS_Init_Timer2(const unsigned char TICK_MS)
{
unsigned long Inc;
unsigned int Reload_16;
unsigned char Reload_08H, Reload_08L;

T2CON = 0x04;

Inc = (TICK_MS * (OSC_FREQ/1000)) / OSC_PER_INST;
// Inc = 60,000 = 0xEA60
Reload_16 = (65536UL - Inc); // Reload_16 = 5536 =0x15A0

Reload_08H = (Reload_16 / 256);
Reload_08L = (Reload_16 % 256);

TH2 = Reload_08H; // 0x15
RCAP2H = Reload_08H;
TL2 = Reload_08L; // 0xA0
RCAP2L = Reload_08L;

ET2 = 1;
TR2 = 1;

EA = 1;
}

void sEOS_Go_To_Sleep(void)
{
PCON |= 0x01; // enter idle mode (generic 8051 version)
}


Thank You