If the command is not found, then it returns 0.
Otherwise it places information about the command
in the \fBTcl_CmdInfo\fR structure
pointed to by \fIinfoPtr\fR and returns 1.
A \fBTcl_CmdInfo\fR structure has the following fields:
.PP
.CS
typedef struct Tcl_CmdInfo {
    int \fIisNativeObjectProc\fR;
    Tcl_ObjCmdProc *\fIobjProc\fR;
    void *\fIobjClientData\fR;
    Tcl_CmdProc *\fIproc\fR;
    void *\fIclientData\fR;
    Tcl_CmdDeleteProc *\fIdeleteProc\fR;
    void *\fIdeleteData\fR;