# License Options

> [HTML Version](licenseoptions.htm)

Here is a complete listing of the options available in A-Shell. In order to be useable, each of these options must be enabled via the product key. 

| **License**<br>**Code** | **Full Name of Licensed Option** | **Description** |
|------|------|------|
| POLY | PolyShell | Permit multiple sessions from a single A-Shell node. Applies only in Unix environments, is meaningless in Windows. |
| ISMA | ISAM-A | Enables the use of the ISAMA (aka d-ISAM, aka ISAM-Plus) file system. |
| ATE | A-Shell Terminal   <br>Emulator | Allows telnet-connected PCs to create user sessions on Unix systems. Improves performance in PC networks. |
| ATS | A-Shell Telnet   <br>Service Daemon | Implements telnet on PC. Is normally required for terminal connections under Unix, improves performance in PC networks. |
| PDFX | PDFX | Generates and post-processes PDF files. |
| ASQL | ASQL | Provides connectors to SQL databases and thereby bi-directional data exchange with those databases. |
| AXL | A-Shell XLS   <br>Library | Provides a function library with which to read and create XLS/XLSX files—i.e., Excel and other spreadsheets. |
| EM | Expiration Message | Causes alerts to pop-up as license expiration date nears. |
| GRP | [Group License](otherlicensematters.htm.md#grouplicensing) | Allows the subdivision of an A-Shell license, thereby insuring that a given subgroup of A-Shell users cannot use more than their allocated number of nodes.  |
| SNL | Strict Node Licensing | Causes each foreground session to count against the license. Otherwise, sessions from the same PC usually share a node. |
| EFS | Encrypted File   <br>System | Provides secure file encryption at a layer "below" programmer control, so programmer doesn't have to deal with encryption issues. |
| CGIX | CGI Exemption | Exempt CGI sessions from the license count, so as to permit a large and unknown number of simultaneous CGI sessions. |