XmCreateScrolledText

I have a doubt with XmCreateScrolledText:

char* p;
int argcnt=0;
XtSetArg(args[argcnt],XmNbottomWidget, _msgBox);argcnt++;
XtSetArg(args[argcnt],XmNeditMode, XmMULTI_LINE_EDIT);argcnt++;
XtSetArg(args[argcnt],XmNeditable, False);argcnt++;
XtSetArg(args[argcnt],XmNscrollHorizontal, True);argcnt++;
XtSetArg(args[argcnt],XmNmappedWhenManaged, True);argcnt++;
XtSetArg(args[argcnt],XmNtraversalOn, False);argcnt++;

_vResp=XmCreateScrolledText(Form,"ventanaResp",args,argcnt);

...
p=XmTextGetSelection(_vResp);

Do exists a limit for the number of characters contained in "_vResp"?

thanks a lot.