Original from  Gautam Lad  to **Anybody** on 12-10-1996
Original Subject: DosStartSession rc=191 fo

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GL> I'm using DosStartSession to launch programs the user wants.  Here's my class:
GL> APIRET Launch::Start(HWND hwnd, PSZ Executable, PSZ Title)

GL> sdata.SessionType = 2;
     
  SessionType (USHORT) 
     The type of session that should be created for this program. 

     The values of this field are shown in the list below: 

     0        SSF_TYPE_DEFAULT 
              Use the PgmHandle data, or allow the Shell to 
              establish the session type. 

     1        SSF_TYPE_FULLSCREEN 
              Start the program in a full-screen session. 

     2        SSF_TYPE_WINDOWABLEVIO 
              Start the program in a windowed session for 
              programs using the Base Video Subsystem. 

     3        SSF_TYPE_PM. 
              Start the program in a windowed session for 
              programs using the Presentation Manager services 
              (including AVIO calls). 

     4        SSF_TYPE_VDM 
              Start the program in a full-screen DOS session. 

     7        SSF_TYPE_WINDOWEDVDM 
              Start the program in a windowed DOS session. 
  
 Why not try a session type of 0? 

 If you wish, you could also use DosQueryAppType to dynamicly 
determine the sessiontype needed for the app. This would allow you to 
"restrict" the application types that user could ask you to run. 

GL> Here, if the program (Executable) is a DOS program, the program returns an 
GL> error 191 for rc (the ERRORBUF messagebox).  It works find 

  191   ERROR_INVALID_EXE_SIGNATURE 
          EXE signature is not valid - file is a DOS mode 
          program or an improper program. 


   Denis       

 All opinions are my very own, IBM has no claim upon them
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