TRACE Built-In Sequence Variables
| $SAA | SeqReg[27] | SAA Flag |
| $HLF | SeqReg[28] | High Latitude Flag |
| $AAZ | SeqReg[29] | Atmosphereic Absorption Zone(?) |
| $CBS | SeqReg[30] | Chronological Buffer Usage (MegaBytes) |
| $MMS | SeqReg[31] | Mass Memory Status |
| $FEF | SeqReg[32] | Flare Event Flag |
| $SEF | SeqReg[33] | SuperFlare Event Flag |
| $TEF | SeqReg[34] | Transient Event Flag |
| $NBF | SeqReg[35] | Number of Small buffers available |
| $CBF | SeqReg[36] | Current small buffer number |
| $TRC | SeqReg[37] | Target Class |
| $MXR | SeqReg[38] | Imax Row |
| $MXC | SeqReg[39] | IMax Column |
| $MXV | SeqReg[40] | Imax Value |
| $MNR | SeqReg[41] | Imin Row |
| $MNC | SeqReg[42] | Imin Column |
| $MNV | SeqReg[43] | Imin Value |
| $RTN | SeqReg[44] | Return Status |
| $PRI | SeqReg[45] | Priority |
| $PND | SeqReg[46] | Sequence Pending Flag |
| $RPT | SeqReg[47] | Sequence Repeat Count |