LPCTSTR or PCTSTR which one should we use?

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Hello:

Which one we should use, LPCTSTR or PCTSTR and
LPTSTR or PTSTR. and why ?
what is the difference between these defined typedefs?

Thanks,

.

Follow-Ups:
- Re: LPCTSTR or PCTSTR which one should we use?
  - From: John Carson

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