'''This page is maintained for historic purposes. The keyword is [[Keywords_currently_not_supported_by_QB64|not supported in QB64]]. Reading values is supported with [[ENVIRON$]].

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The [[ENVIRON]] statement is used in DOS/Windows to temporarily set or change an environmental string value.


{{PageSyntax}}
: [[ENVIRON]] {{Parameter|stringExpression$}}


{{PageDescription}}
* [[Keywords_currently_not_supported_by_QB64|Not supported in QB64.]]
* The {{Parameter|stringExpression$}} must include the environmental parameter ID and the setting:
** Using an '''=''' sign: [[ENVIRON]] "parameterID=setting"
** Using a space: [[ENVIRON]] "parameterID setting"
* If the parameter ID did not previously exist in the environmental string table, it is appended to the end of the table.
* If a parameter ID did exist, it is deleted and the new value is appended to end of the list.
* DOS discards any changes when your program ends so the program must set them when run.
* '''WARNING:''' The amount of space in a environmental table is limited and may create memory errors.


{{PageSeeAlso}}
* [[ENVIRON$]]
* [[Windows Environment]]


{{PageNavigation}}