Environment variables in computer system?

Andrew Sinatra: There are some that are predefined, but you can use your own as well.The problem is that environment variables aren't very well supported anymore. Environment variables were originally created for DOS programs, and have been held over in case someone still wants to run a DOS program.I suggest you read & write to the registry -- it's designed to be a better way to handle variables for program execution....Show more

Raymon Fiene: Both. There are many pre-defined environment variables that are most common in helping people access frequently used things.However, you can always make your own variables, temporary or permanent. The SET command in DOS helps for temporary commands.SET variable = value.Then %variable% is your new environmenta variable.For permanent changes, Windows XP has an interface for this in System Properties (under the Advanced tab), or you can edit registry keys.HKEY_CURRENT_USEREnvironmentHKEY_LOCAL_MACHINESYSTEMCurrentControlSetContr! olSession ManagerEnvironment...Show more

Minh Lefrancois: Right click on the 'My Computer' iconSelect PropertiesClick on the advanced tab on the popupAt the bottom is the Environmental Variables button that will give you the popup to change them.

Charlotte Bryar: I am working on windows XP and confused with environment variables. Are environment variables predefined or can we create oer own environment variables ?

Ronny Dorge: Here's something the refers to Vista, but virtually all the environment variables are the same.http://vlaurie.com/computers2/Articles/environment...And if you are at the DOS prompt, you can simply type "set" (without the quotes) and press ENTER. That will list all the current environment variables....Show more