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A few doubts about winform and SQL database

Time:11-27

Dear teacher, consult a few doubts:
1, I use c # write a winform system, in the department on the server, and then put the link on the home page for the use of colleagues, the colleagues in Beijing, Shanghai, guangzhou, chongqing, but must use the IE browser, use Google browser can't open (company is only allowed to install the two browsers), and the occasional feedback use IE browser to open it, but it is good to restart the browser, the browser is the problem?
2, this system is used directly in c # exe program in the debug, when many people through the link to open the system, resources are consumed with the server? To reach a certain number can cause server, slowly slowly leading to system? (I said that if the installed version is packaged into, find information for the users to download and install, this is the PC resource consumption users, to ensure that the server running speed, is that right?)
3, so many people at the same time open the same system, this system can accommodate how many people use? How much is the number of users (that is, to allow?)
4, because of the cost and complex process problem, we are now 2014 MSSQL database using express, free, in addition to memory and limited capacity, number of concurrent users will also be restricted? Has examined the data, has said it would limit 12 concurrent users, also have said actually does not limit, 12 concurrent users are official rhetoric, but does not limit, technical (but in actual operation, a colleague feedback when the operating system, sometimes the system will jump out of an error message, said that the computer has reached the maximum number of users, but after click cancel, also can normal operation, strange,)
5, one of the most headache problem: what circumstance is concurrent users? Is the same time, to add or delete database changes can be referred to as concurrent users, or say as long as into the system, even if you can't stay also calculate concurrent users? If the former is still good, after all the operation database is instantaneous, the small probability will be as many as 12 people in a moment at the same time, if the latter is in trouble, because there may be dozens of people into the system, (most of the time is to stay on the interface), there is a saying, said that the user is refers to the database to create a login name, such as the sa is a user, so sa2 is the second user, to be like this, it was well done, I wrote two systems, with sa and sa2, respectively, is not only take up two seats? The individual feels that don't look,
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