If %DISPLAY is executed within a SUBMIT block, SAS may hang.

The macro %WINDOW/%DISPLAY is not allowed within a SUBMIT/ENDSUBMIT block.

   /** This would fail within SCL **/
   %window info         
     #5 @5 'What is your name?'       
     #5 @26 name 8 attr=underline;
   %display info;
   proc optmodel;
      str name;
      submit / out name;
      %display info;
      endsubmit;
      put name;
   quit;

   /** This would work within SCL **/
   proc optmodel;
      str name;
      submit / out name;
         data _null_;
            length name $20;
            window info         
              #5 @5 'What is your name?'       
              #5 @26 name attr=underline;
            display info;
            call symput('NAME', name);
            stop;
         run;
      endsubmit;
      put "Hello, " name ".";
   quit;

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