Function            isNLSFuncCom - is NLSFUNC.COM installed

  Syntax              unsigned char isNLSFuncCom(void);

  Prototype in        doshk.h

  Remarks             checks if NLSFUNC.COM is installed.

  Return value        returns one of the following values:

                           0x00 - not installed, OK to install
                           0x01 - not installed, not OK to install
                           0xFF - installed

  Example             #include <doshk.h>

                      main()
                      {
                           printf("NLSFUNC.COM is ");
                           if (isNLSFuncCom() != 0xFF)
                                printf("not ");
                           printf("installed\n");
                      }