| Business | Phone |
| Pmc Information Systems Inc 1260 Grove Ct, Lake Forest 60045 | (847) 615-3400 |
| Wingman Technologies 936 Ringwood Rd, Lake Forest 60045 | (847) 234-9009 |
| Expert Object Corp 222 E Wisconsin Ave 15, Lake Forest 60045 | (847) 615-8400 |
| Micro International 1165 Mount Vernon Ave, Lake Forest 60045 | (847) 735-0800 |
| Micro International 1343 N Western Ave # 2, Lake Forest 60045 | (847) 735-0800 |
| Intermedia Systems Inc 736 N Western Ave, Lake Forest 60045 | (847) 295-6400 |