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                               tsr_install
   Usage
   #include <tsr.h>
   int tsr_install(int flag);

   Description
   Causes  the program to terminate but stay resident. Installs  the  TSR
   interrupt  handlers  and  sets up the hotkey. If  flag  is  TIMESLICE,
   popmain  is called on the timer interrupt, a maximum of 18.2  times  a
   second. If flag is POPONLY, popmain is activated only when the  hotkey
   is pressed. The value TSR_DEBUG can be ored with flag so that the  TSR
   is installed with debugging mode turned on.

   Return Value
   Returns  1  if  it  cannot install because  another  copy  is  already
   installed. If the function is successful it does not return.