126 Prohibit a program to run multiple times, very

Title: 126

Description: Prohibit a program to run multiple times, very good VB source code for VB enthusiasts learning research.

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（实例126）禁止一个程序运行多次\Form1.frm
...............................\PROJECT1.VBP
...............................\PROJECT1.VBW
（实例126）禁止一个程序运行多次

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