$ pm_example.pl
Processing: './pm_1077685_A.txt'
	Line 1: no plate info
	Line 2: ... PlateID 123 ...
		Process PlateID '123' from './pm_1077685_A.txt'
	Line 3: ... PlateID 456 ...
		Process PlateID '456' from './pm_1077685_A.txt'
	Line 4: no plate info
Processing: './pm_1077685_B.txt'
	Line 1: no plate info
	Line 2: ... PlateID 789 ...
		Process PlateID '789' from './pm_1077685_B.txt'
	Line 3: ... PlateID ...
		popup_error_window(./pm_1077685_B.txt)
Processing: './pm_1077685_C.txt'
	Line 1: no plate info
	Line 2: ... PlateID 000 ...
		Process PlateID '000' from './pm_1077685_C.txt'
	Line 4: no plate info