Dear Warren,

<<What is the formula in GridView to give a pop-up prompt to enter text?>>

As an addition to Steve's post, watch out for the need to also TRIM the field you want to pass the query to, else you will do the function called QUERYSTRING and your report returns empty.

My advice is to always TRIM the target FIELD.

See examples below...
>>>>>>
Example #1 - Trim

TRIM({Posting Seq}) = QUERYSTRING("ENTER Post Seq number","12345")


>>>>>>
Example #2 - Use of AND function


AND(
{Trx Date} >= Querydate("Enter Start Date YYYYMMDD", DATE(2010,01,01))
,
{Trx Date} <= Querydate("Enter End Date YYYYMMDD", DATE(2010,12,31))
,
TRIM({LCUST})= QUERYSTRING("ENTER PATIENT ID","MOOK")
)



....

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Explanation:
The target Field in example 1 is {Posting Seq}

Had to TRIM Field so that the data entered via QUERYSTRING("ENTER Post Seq number","12345") would be recognized by Gridview...

Use AND function to extend your pop-up prompt to enter multiple text or dates
>>>>