All functions require an "#include" statement for the system header file OS2.H:

#include  <OS2.H>

Most functions also require a "#define" statement to select an appropriate (conditional) section of the header file, and hence, the required prototype. Where this is necessary, it is shown at the head of the function definition in the form:

#define   INCL_name

Note: These "#define" statements must precede the "#include <OS2.H>" statement.

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