| ActiveTcl User Guide |

### Tcl >> Tcl C Procedures >> Commands

Commands
    Tcl_AddErrorInfo - retrieve or record information about errors and other return options
    Tcl_BackgroundError - report Tcl error that occurred in background processing
    Tcl_CreateCommand - implement new commands in C
    Tcl_CreateMathFunc - Define, query and enumerate math functions for expressions
    Tcl_CreateObjCommand - implement new commands in C
    Tcl_Panic - report fatal error and abort
    Tcl_SaveResult - save and restore an interpreter's state
    Tcl_SetErrno - manipulate errno to store and retrieve error codes
    Tcl_SetResult - manipulate Tcl result

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