checkupdate_pivmat connects on the PIVMat webpage and checks for a new 
version. 
 
checkupdate_pivmat('dialog') does the same, but outputs the result in 
a dialog box. 
 
RES = checkupdate_pivmat returns 
  0 : server unavailable 
  1 : no new version available 
  2 : a new version is available online 
  3 : the online version is older than the currently installed one. 
 

about_pivmat. 
Published output in the Help browser 
   showdemo checkupdate_pivmat