Environment is a class designed to contain user environment variables.
These variables are accessible through the functions sys(fieldName, value) and usr(fieldName, value). If the second parameter is missing, it is assumed that you are reading the value; otherwise, you are setting it (jQuery-style).
There is also the method field(fieldName), invoked in the saving process by the OptimisticLocking class. By default, for "stamp" fields (lt, ct), it returns the current date; otherwise, it returns the value set for that field (lu, cu), usually set in the application when the environment is created.
The Environment class is calculated when the user authenticates, using the calcUserEnvironment method. However, before invoking calcUserEnvironment, it is necessary to set the values for sys("idcustomuser") and optionally sys("idflowchart") and sys("ndetail"). This method essentially calls the stored procedure compute_environment and copies the values returned (two tables) from it to the sys and usr dictionaries.
The values returned by calcUserEnvironment are rows with three columns: mustquote (S/N), variablename, value. mustquote is 'S' if it is necessary to quote the value with single quotes in the value column, but this only applies to the usr table.
It is worth noting that in the calculation of the Environment, for strings returned by the stored procedure that contain substrings of the form <%sys[fieldName]%> or <%usr[fieldName]%>, these are replaced with the values of sys(fieldName) or usr(fieldName) available at the moment, recursively until there are no more such substrings.