# Exclusion/Conflict Simulation

## Test Cases

| Test ID | Description |
|---------|-------------|
| EX-N001 | Simulate concurrent READ scenario |
| EX-A001 | Simulate WRITE conflict (STATUS 48 check) |
| EX-A002 | OPEN mode violation (STATUS 37 for nonexistent file) |
| EX-A003 | Re-OPEN when already OPEN (STATUS 41) |

## Features Covered
- FILE STATUS checking for conflict detection
- WRITE on INPUT-only file (STATUS 48 behavior)
- OPEN non-existent file (STATUS 35/37)
- Re-OPEN without CLOSE (STATUS 41)
- Sequential file access mode enforcement

## Expected Results
All 4 tests should display PASS. File status codes should be detected appropriately.