Input:
All input files are already open, so do not call fopen() to open any file. You
may immediately begin reading from the necessary file without an explicit call
to fopen(), e.g., fscanf( scriptfp, ... ). Also, do not close any file.
Remember to type "make data3files" to get the necessary .dat files for
objective 3.

Output:
All output must be written to simout, e.g., fprintf( simout, ... ).
The following functions will probably produce output of some sort:
	Get_Script(), Next_pgm(), Get_memory(), End_Service(), Abend_Service()
This is not an absolute rule, just a recommendation. Refer to ossim.out (by
typing "make correct-output") to check for the information that must be
displayed and the proper format.

Calling Add_events():
Your code will not call Add_events(). By this I mean, none of the functions
that you write in obj3.c will call Add_events(). The programs are loaded into
memory but are not actually executed. However, Add_events() will still be
called by Load_events() since the LOGON and END events must be processed.
Load_events() is called by the simulator in main(); you do not need to call it.

pcb:
A variable called pcb (process context block) is mentioned throughout the
objective description and is the main object you will be dealing with for this
assignment. This is a variable declared by you in Logon_Service(); it is
dynamically allocated and saved in termtable. A new pcb is created for each
user when they logon (do not allocate one per program). Familiarize yourself
with the fields in a pcb_type structure (it's defined in osdefs.h).