set_timer(5000);
   while (timer_expired() == 0)
   {
      if (KeyPressed())
      {
         switch(GetAKey())
	 {
		case K_ESCAPE:  Gpurge(); return;
		default:  break;
	  }
       }
   }

1. For Win95/98, in C: there is a hidden system file called MSDOS.SYS. In order to be able to edit it, go to a DOS prompt, change to C:, and then type "attrib -h -r -s msdos.sys".
2. Of course, before you edit it, make a backup copy!!
3. Edit msdos.sys. In the [Options] section, add the following lines (or change them if they are already there) to look like this (explained below):
   BootMenu=1
   BootMenuDefault=6
   BootMenuDelay=60
   
4. Save the file, and change it's attributes back to hidden, read-only, system file, by typing "attrib +h +r +s msdos.sys".
5. Reboot, and it should show you the menu.
NOTE: The above options are set so that:

• BootMenu=1 means show the menu. If you no longer want to see the menu, you will have to edit it to say BootMenu=0.
• BootMenuDefault=6 means that if you don't press any menu key, it will automatically boot up with option 6 (command prompt only). In Win98, the value should be 5.
• BootMenuDelay=60 means that it will wait 60 seconds before running the default menu item. The default time is 30 seconds. Of course, you can make it less, if you want.

/* 
#SET _int0  numtimes 1 0 
#SET _int1  cuenum  1  0 
*/ 
// numtimes and cuenum are initially zero, so the first time through 
// the cue will be TEST0. 
// If you want to change this, you will need another external variable 
// to keep track of whether or not it is the first trial...and set 
// up the variables appropriately. 

#include "css_inc.h" 

#define numtimes _int0 
#define cuenum _int1 

main() 
{ 

   if (numtimes < 3) 
   { 
      // you've had less than 3 repetitions of the same item, 
      // so display this same cue again. 
       Gon_off(cuenum, ON); 
       Gflush(1); 
       // do whatever else 
       Gon_off(cuenum, OFF); 
       Gflush(1); 
       // increment counter 
       numtimes++; 
   } 
   else 
   {   // you've had 3 repetitions of the same item, so 
      // reset counter back to 0 
      numtimes = 0; 
      // pick a new cue 
      cuenum = random(1, 10); 
      Gon_off(cuenum, ON); 
      Gflush(1); 
      // do whatever else 
      Gon_off(cuenum, OFF); 
       Gflush(1); 
       // increment counter 
       numtimes++; 
   } 
} 

lower_byte = 359 % 256; 
upper_byte = 359 / 256; 

              MS_TIMERset(REWARD_TIMER, 2); 

              while( MS_TIMERcheck(REWARD_TIMER) > 0 ) 

              {DEVoutp(0,0x2,128);} 

        /**************************************/ 

              set_timer (2); 

              while(timer_expired() > 0 ) 

              {DEVoutp(0,0x2,128);} 

1. I made the first image’s item number the background in the condition file and made the arrow and the second image files different test numbers in the condition file. However, when I tried that, the background turned a very light color and the arrow and images appears with different backgrounds. The first image did not appear at all.
2. Then I made the arrow and the first image’s item numbers, Test0 in the condition file. When I did that, only the face appeared. No arrow appeared. Can I make the images transparent, or layers?

{ 
Gon_off(TEST0, ON); 
Gflush(1); 
encode(number1); 

Gon_off(TEST0, OFF); 
Gflush(1); 
encode(number2); 
} 

        time_t seconds; 
        struct tm *current_time; 

        time(&seconds);  // get time in seconds from Jan 1, 1970 
        // convert to tm struct 
        current_time = localtime(&seconds); 

        // convert it to a string, and copy it into the return 
        // string 
        strcpy(timeStr, asctime(current_time)); 

• Writing to off-screen surfaces and flipping them
• Using palettes
• Controlling refresh rate and resolution
• Using video memory vs. system memory
• Filling vs. outlining objects
• Transparency
• BMP/CTX images, movies, sound)

EYE_WINset(1,0,0,1,1); 

If (ITEM_POSeye_ishere(EYE_WIN, 1)) 
{ 
   Mprintf(1, "eye is in the eye window"); 
} 
else 
{ 
    Mprintf(1, "eye is not in the eye window"); 
}

#include "css_inc.h" 

main() 
{ 
  long    start, stop; 
  long    total; 
  long   count; 

  count = 0; 

  Gmovie_step(TEST0, 0, 1); 
  Gflush(1); 

  set_timer(1000); 
  while(!timer_expired()); 

  set_timer(5000); 
  while (timer_expired() == 0) 
  { 
     Gmovie_step(TEST0, 1, MOVIE_STEP_WRAP); 
     Gflush(1); 
     count++; 
  } 

  Mprintf(2,\"count: %ld\", count); 

  Gon_off(TEST0, OFF); 
  Gflush(1); 
}

#include "css_inc.h" 

main() 
{ 
     int testnum; 
     long current; 
     int i; 

     // seed the random number generator once 
     srand2(time(¤t)); 

     for (i=0; i<10; i++) 
     { 
            testnum = random(0, 3); 
            Gon_off(testnum, ON); 
            Gflush(1); 

            set_timer(1000); 
            while(!timer_expired()); 

           Gon_off(testnum, OFF); 
            Gflush(1); 
      } 
} 

if (get_trial_num() == 0) 
{ 
      srand2(time(¤t)); 
      Mprintf(1, "called srand2"); 
}