| idth="5%"|Length | width="5%"|Windows Versions | width="40%"|Description | | lign="right"|FS:0x00 | align="right"|4 | align="right"|Win9x and NT | Current Secure Exception Handling (SEH) frame |
| lign="right"|FS:0x04 | align="right"|4 | align="right"|Win9x and NT | Top of stack |
| lign="right"|FS:0x08 | align="right"|4 | align="right"|Win9x and NT | Current bottom of stack |
| lign="right"|FS:0x10 | align="right"|4 | align="right"|NT | Fiber data |
| lign="right"|FS:0x14 | align="right"|4 | align="right"|Win9x and NT | Arbitrary data slot |
| lign="right"|FS:0x18 | align="right"|4 | align="right"|Win9x and NT | Linear address of TIB |
| lign="right"|FS:0x20 | align="right"|4 | align="right"|NT | Process ID |
| lign="right"|FS:0x24 | align="right"|4 | align="right"|NT | Current thread ID |
| lign="right"|FS:0x2C | align="right"|4 | align="right"|Win9x and NT | Linear address of the thread local storage array |
| lign="right"|FS:0x34 | align="right"|4 | align="right"|NT | Current error number |