| Address | An email address Rent Stream AI receives mail at |
| Auto routing | An address setting where the AI sends each email to the virtual mailbox whose description fits it best |
| Check | A step that tests the work item is complete and right, and one of the tests inside it |
| Choice | An If and Otherwise card that runs one of two sets of steps |
| Contact | A customer, supplier or prospect MCS has recognised as a sender, with their trust and remembered values |
| Document type | The set of fields a kind of document contains, such as Invoice |
| Endpoint | A read-only query on your MCS database that a Look up in MCS step runs |
| Field | One named piece of information a workflow works with, such as the invoice number |
| Field library | Where every field, document type and choice list is defined |
| Hand to a person | Stop and put the work item in the inbox for someone to deal with |
| Inbox | The list of work items that need a person |
| Reference | A work item's unique code, starting RS-, carried in the subject of every email it sends |
| Remembered value | A value, such as bank details, that a contact keeps so a change is noticed |
| Role (of a field) | What a field means to Rent Stream AI, such as Total amount or Bank account |
| Role (of a person) | What a person is allowed to do, such as Reviewer or Admin |
| Security check | A check that always hands to a person when it fails and can never be weakened |
| Step type | One of the fixed building blocks a workflow is made from |
| Straight through | A work item that reached MCS with no person needed |
| To sort | Mail waiting for a person to choose which virtual mailbox it belongs in |
| Trusted | A contact whose work on a workflow can go straight through, after 3 approvals in a row |
| Virtual mailbox | A named destination, such as "Supplier invoices", that feeds one workflow |
| Work item | One email going through one workflow |
| Workflow | The list of steps that turns one kind of email into a record in MCS |