• Web site : http://www.clustal.org

• License: free to use for non-commercial purposes. Details are available here

<php> /* * DO NOT MODIFY THIS CODE BLOCK UNLESS YOU REALLY KNOW WHAT YOU ARE DOING!! * IT EXISTS TO DISPLAY THE HELP MATERIAL PROVIDED BY THIS APPLICATION! */

$isPresent = exec(“which clustalw2”);

if(strlen($isPresent)==null){

print("The application named clustalw2 is not present on this computer!");

} else{

$data = array();
$tmp = exec("clustalw2 -help",$data);
print("<pre>\n");
foreach($data as $line){
  print($line."\n");
}
print("</pre>\n");

} </php>

• More to come…