Due to its longstanding use, VIQR was a natural choice for computer word processing, prior to the appearance of VNI, VPS, VISCII, and Unicode.
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The VNI Encoding uses two characters to represent one Vietnamese vowel character, therefore removing the need for control characters to represent one Vietnamese character, a problematic system found in TCVN, or using two different fonts such as in VPS, one containing lowercase characters and the other uppercase characters.
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This solution is more portable between different versions of Windows and between different platforms.