Erik Huelsmann doth sayeth in a message unto All:

EH> need to use DosExecPgm and when do I need to use
EH> DosStartSession. (For now I only write VIO-applications, but
EH> that could change soon.)

EH> What are the restrictions to the usage of either of these
EH> functions?

  DosExecPgm() can only be used to start a session of the same type,
DosStartSession() however can be used to start a session of any type. So in
my mind it would be better to use DosStartSession() and save yourself some
trouble should you find you are going to be needing to start DOS
applications.

 See ya,

Craig
cam{at}wpc.cioe.com

... If humans get hemorrhoids, do aliens get asteroids?

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