txt Vs ctxt ui element id in VB Script

Hi ,

There is one custom program which is used to record through standard GUI Scripting recorder capture the UI Element as below:

session.findById("wnd[0]/usr/txtT1").text =  "test"

But when the same program transported to different system , then the screen field is capture as :

session.findById("wnd[0]/usr/ctxtT1").text =  "test1"

So why there is difference in the field element capturing for the same program and same UI field. What is the difference of txt and ctxt id in the VB script?

Regards,

Kapil