Changes an existing entry or places a new entry in the MS-DOS environment.
ENVIRON string_expression
The ENVIRON statement expects a string expression of the same form as the MS-DOS SET command, entry=value.
The change to the environment table is valid only for the life of the program.
You cannot increase the size of the MS-DOS environment in QBasic. To make space in the MS-DOS environment for use by QBasic programs, create a dummy entry with the DOS SET command. Then erase the contents of the entry in a QBasic program to make space for new or changed variables.
Assuming the environment string table is empty, the following statement will create a default path to the root directory on Disk A:
ENVIRON "PROGRAM=TEST"
PRINT ENVIRON$("PROGRAM")
Running this program produces the following:
TEST