how do I do use system clipboard in internal application or .hta ?

Not sure what you mean by "internal application", but an HTA has limited
clipboard access via:

clipboardData Object (window)
http://msdn.microsoft.com/workshop/author/dhtml/reference/objects/cli...

--
Michael Harris
Microsoft.MVP.Scripting
Seattle WA US

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Microsoft? Windows?2000 Scripting Guide
http://www.microsoft.com/technet/scriptcenter/scrguide/sagsas_overvie...