# Input: global assoc. array 'fileRollCall'
# Output: adds/updates key(value) to global assoc array 'fileRollCall';
# Output: returns 0 if app found, 1 otherwise
# Input: global assoc. array 'fileRollCall'
# Output: adds/updates key(value) to global assoc array 'fileRollCall';
# Output: returns 0 if app found, 1 otherwise