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+=====Showing a custom message box in older software=====
+In [[plc:plc_gas_cutting_implementation|previous article]] we showed how to implement oxyfuel gas cutting procedure. Preheat process in gas cutting can last 30-120 seconds. It is convenient to have on screen message that shows preheat progress. Let's add message box with preheat progress countdown for gas cutting.
+Global variables 9100-9163 are reserved to show/hide enumerated Popup message box.
+Writing "1" to register (9100+N) will show Message Box #N on the main screen. Writing "0" will hide the Message Box.
+Content for message box #0...#63 defined in cnc-variables.xml configuraton file by item **cnc-popup-message-0** ... **cnc-popup-message-15**
+<code xml>
+<value name="cnc-popup-message-0"
+  header="Preheat Countdown" footer="sec" message="%d"
+  headerHeight="60" footerHeight="30" width="300" height="150"
+  fontSize="60" headerFontSize="30" footerFontSize="20"
+  timeout="5" dest="cnc-gvariable-99" K="0.001">0</value>
+</code>
+Message box contains 3 lines. Lines defined by attributes **header** (top line), **message** (middle line), **footer** (bottom line). Font size for each line defines by attributes **headerFontSize**, **fontSize** and **footerFontSize**
+Line height for each line defined by attributes **headerHeight**, **height** and **footerHeight**.
+Attributes **width** and **height** define message box width and height in pixels.
+Popup Messagebox will be automatically hidden if variable value was not changed longer than time defined in **timeout** attribute.
+Parameter value can be printed in Message Box. To print a value -
+  * Message attribute should contain C-style contains format line (ie "%d", "%7.3f")
+  * Attribute **dest** should define variable number
+  * Attribute **K** defines scale ratio.
+For example if
+  * message="%d"
+  * dest="cnc-gvariable-99"
+  * K="0.001"
+Variable #99 value multiplied by K-ratio will be printed: if variable value is 95000, value **95** will be shown.
+{{plc:mycnc-eco-popup-message-01.png}}
+Source code to show Message Popup is
+<code c>
+  gvarset(9100,1);  //show the Message Box
+  portset(OUTPUT_OXY_HEAT_HI); //turn ON preheat Valve
+  timer=time_preheat;
+  break_heating=1;	//Set Heating variable.
+  //if the value will be clearen outside of PLC, abort Preheat procedure
+  do {
+    timer--;
+    if (portget(6)!=0)	//if start key is pressed - start piercing
+      {
+	timer=0;	//exit from heating
+      };
+    if (break_heating==0)   //if start key is pressed - start piercing
+      {
+	timer=0;	    //exit from heating
+      };
+    if ((timer&0xff)==0)
+      {
+	gvarset(99,timer); //update Countdown value every 256msec
+      };
+   }while(timer>0);        //Preheat loop
+  gvarset(9100,0);         //hide Message Box
+</code>